You are dispatched to a domestic disturbance. Upon arrival you notice the front door is slightly ajar and hear no sounds inside. What is the MOST important perceptual step before entering?
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A
Knock loudly and announce your presence
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B
Observe and listen at the threshold for at least 30 seconds to detect movement or threats before entering
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C
Immediately enter to check for injured persons
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D
Call for backup before taking any action