Week5_Spring 14_on_line__2_28_14_

Question 1

1. Please choose an item from the list below that does not properly describe flow paths?
   (T.B. Search, glossary)
   A) The movement of heat and smoke from the lower pressure within the fire area towards the
   higher pressure areas accessible via doors, window openings and roof structures.
   B) As the heated fire gases are moving towards the low pressure areas, the energy of the fire is
   pulling in additional oxygen from the low pressure areas.
   C) Based on varying building design and the available ventilation openings (doors, windows,
   etc.), there may be several flow paths within a structure.
   D) Any operations conducted in the flow path will place members at significant risk due to the
   increased flow of fire, heat and smoke toward their position.

Answer 1

1. Answer: A = The movement of heat and smoke from the higher pressure within the fire
   area towards the lower pressure areas accessible via doors, window openings and roof structures

Question 2

2. Upon arrival at the scene of a fire, take the time to orient yourself on the fire-ground. The
   need to take adequate time to perform a size-up to determine the occupancy type and the
   expected life hazard, before attempting a search, cannot be over emphasized. All affected areas
   within the fire building should be searched within the limits of safety. Please choose an incorrect
   search consideration from the list below? (T.B. Search, section 4.2, 4.4. 4.5 & 4.6)
   A) Consider how the heat, smoke and fire will extend within the building.
   B) Members must include the buildings configuration as part of their size-up.
   C) Prior to reaching the fire floor, knowledge can be gained from conducting a survey of the
   floor below to determine the interior hallway layout, apartment numbering system, floor plan of
   the apartment, and closest means of access to a fire apartment.
   D) It is critically important to take into consideration the effects of the wind direction and
   velocity on fire conditions, especially when windows are closed.

Answer 2

2. Answer: D = It is critically important to take into consideration the effects of the wind
   direction and velocity on fire conditions, especially when windows are open or failed.

Question 3

3. When fire officers are about to conduct a search of a fire building the following should be
   taken into account? Please choose the correct item(s) from the list below? (T.B.
   Search, section 4.7)
   A) It cannot be assumed there will be a large number of sleeping occupants in a multiple
   dwelling at night.
   B) Commercial buildings may have watchmen or cleaning personnel working after normal
   business hours.
   C) Commercial loft buildings may have been converted into residential buildings.
   D) Office buildings often have cleaning and maintenance people present day and night.
   E) Computer personnel are often present 24 hours a day.
   F) It cannot be assumed no one is present inside taxpayers that have roll down security doors
   with padlocks in place. Many times people are padlocked in to provide security at night.

Answer 3

3. Answer: B, C, D, E = A = It can be assumed there will be a large number of sleeping
   occupants in a multiple dwelling at night.

F is also true

Question 4

4. Please choose an incorrect search procedure from the list below? (T.B. Search,
   section 4.8 to 4.11)
   A) Information about the location of the occupants and reports of any missing occupants must
   be obtained early in an operation.
   B) Be aware of smoke spread that can be affected by air conditioning systems and vent shafts
   in kitchens and bathrooms.
   C) An engine company should never become involved in search and rescue without
   simultaneously stretching and positioning a hose-line.
   D) In retail establishments all areas must be searched for occupants with particular attention
   given to the rear and main selling area.

Answer 4

4. Answer: C = Only in extreme cases should an engine company become involved in search
   and rescue without simultaneously stretching and positioning a hose-line.

Question 5

5. Please choose the correct description(s) of “primary search” from the list below?
   (T.B. Search, section 6.1 & 6.2)
   A) A primary search is the immediate search for life. This search is rapid but thorough and
   systematic.
   B) The primary search will be influenced by the fire, heat and smoke conditions in a room or
   area, and may be prior to the application of water. It should be done quickly, with due regard for
   your personal safety.
   C) The 1st arriving ladder company is always responsible for the primary search on the fire
   floor or fire area, and the 2nd arriving ladder company is responsible for the primary search on
   the floors above.
   D) All of the above

Answer 5

5. Answer: A & B = C = Usually the 1st arriving ladder company is responsible for the
   primary search on the fire floor or fire area, and the 2nd arriving ladder company is responsible
   for the primary search on the floors above.

Question 6

6. The 1st arriving ladder company’s priorities when conducting a search are: Please choose
   the correct priorities from the list below? (T.B. Search, section 6.3)
   A) Locate the fire area.
   B) Control the door to the apartment or area, and any other ventilation points.
   C) Communicate the fire location to the Engine Officer and the Incident Commander.
   D) Determine if conditions are tenable to support life.

Answer 6

6. Answer: All are correct

Question 7

7. Please choose the incorrect description of “secondary search” from the list below?
   (T.B. Search, section 7.1 to 7.3)
   A) The secondary search is a thorough and painstakingly complete search for life of all areas
   that required a primary search.
   B) The secondary search must also include the entire outside perimeter of the building and all
   shafts, basements, cellars, elevators, roofs, etc.
   C) The purpose of the secondary search is to ensure that no possible victims are overlooked.
   Time is not as important as accuracy.
   D) A secondary search shall be completed before any extensive overhauling of the fire area is
   attempted.
   E) A secondary search should be performed by a different company than the company which
   performed the primary search.

Answer 7

7. Answer: E = A secondary search must be performed by a different company than the
   company which performed the primary search

Question 8

8. Communication between all members and the need to monitor communications when
   conducting a search is imperative to improve the safety and efficiency of operations. Effective
   communications include the following: Please choose the incorrect item from the list below?
   (T.B. Search, section 8.1)
   A) To ensure the safety of the interior team, the outside team must report exterior conditions;
   including the effect wind is having on the smoke and fire. The exterior size-up must be relayed to
   their Officer, the IC or Sector Supervisor (if implemented).
   B) Officers shall communicate with the members of the outside team to determine their
   location and areas they are searching, and require them to maintain contact with the interior
   search team to ensure the outside members’ safety and team integrity.
   C) Members conducting searches will maintain situational awareness by monitoring handietalkie
   transmissions, especially the status of the water supply and the position of precautionary
   hose-lines.
   D) Company Officers must notify the IC or Sector Supervisor (if implemented) when searches
   are completed. Company Officers must also notify the IC or Sector Supervisor (if implemented)
   when search of an area has not been completed.

Answer 8

8. Answer: C = Members conducting searches will maintain situational awareness by
   monitoring handie-talkie transmissions, especially the status of the water supply and the position
   of operating hose-lines

Question 9

9. There are several methods that can be used to perform a search, please choose the most
   correct method from the list below? (T.B. Search, section 9.3)
   A) The method for searching the fire area or apartment is to first locate, contain and isolate the
   fire and then begin the search for life from this point.
   B) When searching for life, continue with the left or right hand search pattern probing toward
   the center of the floor of the room.
   C) The method when searching areas adjacent to or above the fire area, is to start the search
   for life upon entering the area using a left or right handed search pattern.
   D) The search rope method should be used in commercial occupancies or when deemed
   necessary by the unit Officer since it will improve orientation, safety, and provide for a more
   coordinated search.
   E) All of the above.

Answer 9

9. Answer: E

Question 10

10. Prior to forcing an entrance door to a fire occupancy, the Ladder Company Officer shall
    determine: Please choose the incorrect item from the list below? (T.B. Search, section
    9.4)
    A) Is there a report of a life hazard.
    B) Are interior conditions tenable to sustain life or to conduct a search for life.
    C) Are all members in proper PPE.
    D) What is the location and status of the dry (un-charged) hose-line.
    E) Who is the member to remain at the door if the interior search is to be conducted without
    an operating hose-line in place.
    F) What will be your area of refuge, if needed.

Answer 10

10. Answer: D = What is the location and status of the charged hose-line.

Question 11

11. If the engine does not have a charged hose-line at the door to the fire area, the door should
    be closed after the search team enters. Before entering, the Ladder Company Officer shall
    communicate the identity of the fire apartment to the Incident Commander and Engine Officer. A
    firefighter of the interior team must be positioned at the door inside the fire area to maintain
    control of the door until a charged hose-line is ready to advance through that door. The Ladder
    Company Firefighter at the door will: Please choose the correct item(s) listed below for the
    Ladder Company Firefighter positioned at the door? (T.B. Search, section 9.10.1)
    A) Maintain control of the apartment door to control the flow paths of heat and smoke.
    B) Make sure the door doesn’t lock behind the interior team by setting the lock or using a
    large sure search door marker.
    C) Monitor conditions in the immediate entrance area that may affect the safety of the interior
    search team.
    D) Monitor handie-talkie transmissions to maintain situational awareness, especially reports of
    water problems, and wind conditions and its effect on other ventilation points, to ensure the
    safety of the members searching the fire area.
    E) Act as a beacon to guide the searching members back to the door, if necessary.
    F) If members are forced to evacuate, account for the interior team and close the door before
    all members have exited the apartment.

Answer 11

11. Answer: A, B, C, D, E = F = If members are forced to evacuate, account for the interior
    team and close the door after all members have exited the apartment.

Question 12

12. While conducting a search, attempt to locate and confine the fire to the area of origin until
    the hose-line is in position to reduce the number of people endangered. Once the fire area has
    been determined, it should be confined by: Please choose the correct method(s) to confine the
    fire area? (T.B. Search, section 9.10.2)
    A) Closing an open door to the fire apartment, to gain control of the public hallway and stairs.
    B) Closing the door to a fire room to prevent a flow path for the fire toward the apartment
    door when the hose-line enters the apartment.

Answer 12

12. Answer: A & B

Question 13

13. When entry is to be made through a window there are certain procedure that need to be
    followed, please choose the incorrect procedure from the list below? (T.B. Search,
    section 9.11)
    A) Prior to entering a window to perform a search, a member shall notify their officer.
    B) All horizontal ventilation tactics, whether Ventilation for Extinguishment or Ventilation for
    C) Search, require communication with, and coordination by, the Engine Company Officer
    operating inside the fire area to be vented.
    D) Be cautious when breaking glass since an unconscious person may be lying on the other
    side.
    E) Before entering, probe for possible victims, and then check the floor for stability.
    F) Before entering an apartment clear out the entire window. Removing it will provide a larger
    and better means of egress if conditions deteriorate.

Answer 13

13. Answer: B = All horizontal ventilation tactics, whether Ventilation for Extinguishment or
    Ventilation for Search, require communication with, and coordination by, the Ladder Company
    Officer operating inside the fire area to be vented

Question 14

14. A thorough size-up of the conditions on the fire floor shall be performed before going
    above the fire. When deciding whether to go above, consider the following: Please choose an
    incorrect item? (T.B. Search, section 10.1)
    A) What is the location of the fire.
    B) Do they have control of the door to the fire area.
    C) Do they have a dry (un-charged) hose-line on the fire floor.
    D) Is the hose-line advancing into the fire area.
    E) Are there water problems.
    F) Is there a need for protection with a hose-line above the fire floor.

Answer 14

14. Answer: C = Do they have a charged hose-line on the fire floor

Question 15

15. Prior to proceeding above the fire, notification must be made to officers on the fire floor.
    Acknowledgement of this message must be received before proceeding above. This is necessary
    to ensure that the officers of units operating on the fire floor will know who must be notified of
    any situation necessitating their withdrawal from the floor above. Means of access to the floor
    above are: Please choose the most correct answer? (T.B. Search, section 10.4)
    A) Interior stairs
    B) Fire escapes
    C) Via ladders (Portable, Aerial or Tower ladder)
    D) All of the above

Answer 15

15. Answer: D

Question 16

16. The progress of the ____________ on the fire floor below must always be monitored and
    used as the indicator governing how far the searching members will continue to advance on the
    floor above the fire. Please fill in the blank? (T.B. Search, section 10.6)
    A) search team
    B) hose-lines

Answer 16

16. Answer: B

Question 17

17. Water problems (burst length), should be transmitted as an Urgent handie-talkie message.
    The Incident Commander shall ensure that members operating above the fire are aware of the
    problems on the fire floor. Please choose the most correct procedure for searching members
    operating on the floor above to follow? (T.B. Search, section 10.6 Note)
    A) If there is any indication of a delay in putting water on an uncontrolled fire, all members
    operating above the fire should seek refuge by returning to the fire floor or floor below.
    B) They may resume operations on the floor above once the water problem on the fire floor
    has been resolved.
    C) Searching for fire extension is not a valid reason to remain above an uncontrolled fire.
    D) All of the above.

Answer 17

17. Answer: D

Question 18

18. The Thermal Imaging Camera (TIC) is a valuable tool that can be used for many
    operations. TICs provide a pictorial representation of temperature differences that are unaffected
    by smoke. Please choose an incorrect procedure from the list below when using the TIC?
    (T.B. Search, section 11)
    A) The TIC is only a tool and shall be used as an adjunct to, not a replacement of, the
    established firefighting search procedures and practices already in use.
    B) TICs must be carried by Ladder Company Officers and used at all responses.
    C) At all times, the TIC shall be used in conjunction with a systematic search plan allowing
    Ladder Company Officers the ability to maintain a supervisory role of members involved in the
    search.
    D) When confronted with smoke conditions negating visibility, a TIC can give the Ladder
    Company Officer the capability to visualize the convection and radiant heat waves being
    generated by the fire and can visually provide an early warning of a rapidly expanding fire.

Answer 18

18. Answer: B = TICs must be carried by Ladder Company Officers and used at all structural
    responses.

Question 19

19. Members should attempt to remove a victim via the safest route available. The preferential
    order of removal is: (T.B. Search, section 13.2)
20. Interior Stairs
21. Horizontal Exits
22. Fire Escape
23. Ladders
24. Life Saving Rope
    A) 2, 3, 1, 4, 5 B) 3, 4, 5, 1, 2 C) 1, 2, 3, 4, 5 D ) 5, 4, 3, 2, 1

Answer 19

19. Answer: C

Question 20

20. Most fire victims found during primary searches are usually found in these areas: Please
    choose the incorrect item from the list above? (T.B. Search, section 13.3)
    A) Within the area of fire origin.
    B) In a path leading from the area of fire origin towards an exit.
    C) In the apartment or occupancy directly above the fire in fireproof multiple dwellings.
    D) On the top floor of non-fireproof multiple dwellings.
    E) In hallways and stairways in fireproof multiple dwellings.

Answer 20

20. Answer: C = In the apartment or occupancy directly above the fire in non-fireproof
    multiple dwellings.

Question 21

1. Which of the following would not be defined as a “known” life hazard? (1.4)
   A) A victim that can be seen by the rescuer
   B) A victim that can be heard by the rescuer
   C) A person at the scene indicating the location of a life hazard
   D) A member has information from any source indicating the location of a life hazard

Answer 21

1. D - information from a credible source, not any source

Question 22

2. In all instances, where rescue activity is taken by an individual member to locate a known
   life hazard, the ______________ must forward a report detailing full particulars to the
   __________. (1.4)
   A) Incident Commander/ Chief of Safety
   B) Incident Commander/ Chief of Operations
   C) Ladder Company Officer/ Chief of Safety
   D) Ladder company Officer/ Chief of Operations

Answer 22

2. B

Question 23

3. When one 5 FF Engine is on scene, the Safety Team is composed of whom? (2.1.1)
A) ECC and BU
B) ECC and Door
C) Control and Door
D) Control and ECC
E) BU and Control

Answer 23

3. C

Question 24

4. When one 5 FF Ladder Company is on scene, the Safety Team is composed of whom?
   (2.1.1)
   A) LCC and OV
   B) LCC and Roof
   C) Roof and OV
   D) FE and OV

Answer 24

4. A

Question 25

``` 5. The arrival of which company must be announced over the handie talkie? (2.2) A) 1st due truck B) 2nd due truck C) 2nd due engine D) 3rd due engine ```

Answer 25

5. C

Question 26

``` 6. The Safety Team shall normally consist of which firefighters? (2.1.1) A) 1st due LCC and 1st due ECC B) 2nd due LCC and 2nd due ECC C) 1st due BU and 1st due Control D) 2nd due BU and 2nd due Control ```

Answer 26

6. D

Question 27

7. The FAST unit shall report to and stage near the ___________, within ________ contact, at a position from which they can be readily deployed. (3.1) A) Staging Area/ Verbal B) Staging Area/ Visual C) Incident Command Post/ Visual D) Incident Command Post/ Verbal

Answer 27

7. D

Question 28

8. When communicating to other units, the FAST officer and member’s radios designation shall include the word FAST after the units designation. Ex: “L-157 FAST to command” (4.3) A) True or B) False?

Answer 28

8. True

Question 29

9. When communicating between FAST unit members, use the word FAST after the units designation. Ex: “L-157 FAST CAN to L-157 FAST” (4.4) A) True or B) False?

Answer 29

9. False - communicating between members does NOT require the use of the word FAST.- “Ladder 157 CAN to Ladder 157”

Question 30

10. Two of the following assignments are NOT required to be given out at roll call by the Ladder officer. Which are they? (5.1) A) Member assigned to the FAST Pak B) EFAS trained member to monitor the EFAS and FAST radio C) Member assigned to drag the Stokes basket D) Member assigned to packaging downed member

Answer 30

10. C and D are not mentioned

Question 31

11. Which of the following statements is FALSE about FAST unit operations? (7) A) The Search Team shall make entry to locate, package, and remove the member if possible B) The Removal/ Resource Team will stage at the entrance and be available to assist. C) The FAST unit shall split up to cover more area in large commercial or complex buildings D) Use a two sided approach where the search team makes access via the interior and the removal team makes access via the exterior of the building

Answer 31

11. C - remain intact and do NOT split up when dealing with large commercial or complex buildings

Question 32

``` 12. Which of the following tools is not mentioned for the FAST unit to report to the ICP with? (8) A) FAST Pak B) Life Saving Rope C) Stokes Basket with long backboard D) 2:1 rope ```

Answer 32

12. B - Search rope

Question 33

13. When monitoring the FAST radio, the EAB button is depressed by Squad 18’s ECC, which internal ID code will appear on the FAST radio? (3.1) A) 8018002 B) 6018005 C) 5018003 D) 8018004

Answer 33

13. A

Question 34

14. The FAST unit officer shall NEVER get physically involved in the operation. It is the responsibility of the officer to supervise the operation and keep the members focused with the job at hand. (3.1) A) True or B) False?

Answer 34

14. False - Unless there is no one else available, the officer should not get physically involved in the operation

Question 35

15. Which of the following are responsibilities of the company officer of a FAST unit when put to work to remove a downed member? (more than one correct) (3.1) A) Secure the removal route B) Call for an additional FAST Pak if the first is placed into operation C) Get the identification of the member to the IC D) Transmit the Mayday/ Urgent, if it has not already been done

Answer 35

15. A,B,C, D

Question 36

841. CDA buildings shall be inspected if they are more than? (CDA 2008 Pg 1) A. 35 feet in height B. 7500 feet in their footprint

Answer 36

841. A, B

Question 37

842. At a construction site, the Fire Commissioner may issue a? (CDA 2008 Pg 2-3) A. “Order to Discontinue Work” with regard to specific items regulated by the Fire Code or RCNY’s B. Stop Work Order

Answer 37

842. A (b—ONLY DOB MAY ISSUE STOP WORK ORDER)

Question 38

843. At a CDA site, if a DOB Permit is not present, units shall forward a High Priority Referral Report. (CDA 2008 Pg 3) A. Agree or D. Disagree?

Answer 38

843. AGREE

Question 39

844. At a CDA site, there must be a sign no more than ______ high above the ground on each perimeter of the site fronting on a public thoroughfare indicating information about the owner, general contractor and phone number for reporting complaints? (CDA 2008 Pg 4) A. 6 B. 8 C. 10 D. 12

Answer 39

844. D

Question 40

845. If exterior walls are not in place, stored materials shall be kept back from walls at least 10 feet. However, when the floor area is less than 1000 square feet, stored material may be kept not less than 5 feet back from the perimeter of the building. (CDA 2008 Pg 6) A. Agree or D. Disagree?

Answer 40

845. AGREE

Question 41

846. Combustible waste material in excess of _____ cubic yards shall be removed daily before the close of the work day at a CDA site? (CDA 2008 Pg 7) A. 5 B. 10 C. 15 D. 20

Answer 41

846. C

Question 42

847. AT CONSTRUCTION sites, it is correct to state standpipe systems? (CDA 2008 Pg 11) A. Are required when work reaches a height greater than 75 feet in building where standpipes will be required B. When required, they shall be dry if freezing conditions may be encountered C. In concrete construction, shall be maintained and capped one floor below the stripping floor (3 floors—below the most recently poured floor) D. In steel construction, shall be maintained and capped one floor below the walking floor

Answer 42

847. A, B, C, D

Question 43

848. At DEMOLITION sites, it is incorrect to state standpipe systems? (CDA 2008 Pg 12) A. Shall be maintained as dry systems B. Shall be capped above the outlet on the floor immediately below the floor being demolished C. Require appropriate standpipe hose, nozzles or spanners D. Must have a metal sign at the Siamese hose connection reading “Standpipe Siamese Connection” and have a red light lit at night

Answer 43

848. C (NOT REQUIRED)

Question 44

849. At DEMOLITION sites, it is correct to state standpipe systems? (CDA 2008 Pg 12) A. May be used for water supply for demolition operations B. Must be drained in freezing weather after use C. May be used for compressed air if there are two or more risers—but only one riser may be used. D. FDNY approval is required for use of compressed air in a riser

Answer 44

849. At DEMOLITION sites, it is correct to state standpipe systems? (CDA 2008 Pg 12) A. May be used for water supply for demolition operations B. Must be drained in freezing weather after use C. May be used for compressed air if there are two or more risers—but only one riser may be used. D. FDNY approval is required for use of compressed air in a riser

Question 45

850. At DEMOLITION sites, it is incorrect to state sprinkler systems? (CDA 2008 Pg 12-13) A. Shall be maintained as non-automatic systems B. Shall be capped above the outlet on the floor immediately below the floor being demolished C. Are required for partial systems where there are no Siamese connections D. Must have a metal sign at the Siamese hose connection reading “Sprinkler Siamese Connection” and have a red light lit at night

Answer 45

850. C (NOT REQUIRED FOR PARTIAL SPRINKLER)

Question 46

851. Where a building is constructed to a height greater than _____ stories or _____ feet, a stairway must be provided? (CDA 2008 Pg 14) A. 4, 50 B. 5, 60 C. 6, 70 D. 7, 75

Answer 46

851. A

Question 47

852. The maximum distance between the working deck of a building under construction or demolition and the highest floor accessible to a temporary or permanent stair shall be no more than _____ feet or _____ floors? (CDA 2008 Pg 15) A. 40, 4 B. 50, 5 C. 60, 6 D. 75, 7

Answer 47

852. A

Question 48

853. Once construction reaches a height of 75 feet, the maximum distance between the working deck of a building under construction or demolition and the highest floor accessible to a temporary or permanent elevator or hoist shall be no more than _____ feet or _____ floors? (CDA 2008 Pg 15) A. 40, 4 B. 50, 5 C. 60, 6 D. 75, 7

Answer 48

853. D

Question 49

854. During torch operations, at least one fireguard is required for each torch operator and an additional fireguard is required on the floor below the torch operation. (CDA 2008 Pg 15) A. Agree or D. Disagree?

Answer 49

854. AGREE

Question 50

``` 855. Which of the following devices may be used for curing and drying of concrete and plaster at construction sites, including partially occupied buildings? (CDA 2008 Pg 17-20) A. Coke Salamanders B. Kerosene-fired heaters C. Natural gas heaters D. LPG-fired heaters E. Electric heaters F. Gasoline-fired heaters ```

Answer 50

855. A, B, C, E (D—ONLY IF UNOCCUPIED, F—NOT ALLOWED)

Question 51

``` 856. Which of the following devices may be used for human comfort at construction sites? (CDA 2008 Pg 17-20) A. Coke Salamanders B. Kerosene fired heaters C. Natural gas heaters D. LPG-fired heaters E. Electric heaters F. Gasoline fired heaters ```

Answer 51

856. E

Question 52

857. LPG may be stored at construction sites in a capacity not exceeding ______ pounds in any single facility, or a total capacity not exceeding ______ pounds? (CDA 2008 Pg 19) A. 2500, 5000 B. 3000, 6000 C. 5000, 7500 D. 5000, 10000

Answer 52

857. A

Question 53

858. Fire hoses and nozzles, capable of a continuous flow of 180 gpm with a minimum reach of 35 feet from the nozzle, shall be available prior to any explosives arriving at a demolition site. (CDA 2008 Pg 23) A. Agree or D. Disagree?

Answer 53

858. AGREE

Question 54

859. Generally, openings in any floor for the removal of debris, bricks and similar material, shall not aggregate more than ______ % of the floor area? (CDA 2008 Pg 24) A. 10 B. 20 C. 25 D. 30

Answer 54

859. C

Question 55

860. All openings in floors , except for the top or working floor, used for debris removal shall have a tight enclosure from floor to floor of planking not less than ______ inches in thickness. (CDA 2008 Pg 24-25) A. 2 B. 3 C. 4 D. 5

Answer 55

860. A