An officer responds to a report of a man with a gun. Dispatch advises the suspect is in an apartment on the 4th floor. The officer's FIRST action upon arrival should be:
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A
Immediately enter the building and proceed to the 4th floor
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B
Establish a perimeter, contact dispatch for updates, and wait for backup
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C
Knock on the apartment door and announce police presence
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D
Evacuate the entire building before taking action