An officer is dispatched to a "person with a gun" call. Upon arrival, witnesses point to a man walking quickly down the street with his hand in his waistband. The officer should:
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A
Draw a weapon and immediately order the subject to the ground
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B
Approach casually to avoid alarming the subject
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C
Maintain a position of tactical advantage, issue clear verbal commands, and be prepared for escalation
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D
Wait at the scene perimeter for SWAT