Before students begin unloading, what must the school bus driver do after stopping at the unloading zone?
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A
Open the door and allow students to exit immediately
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B
Shift to park (or neutral with brake set), activate the stop-arm and amber/red lights, and ensure the zone is safe before opening the door
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C
Flash the headlights to alert nearby motorists
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D
Sound the horn twice to signal students to stand