893.Regarding 'shoulder use' and 'breakdown response' on highways, which of the following situations ishandled correctly and can effectively prevent secondary accidents?
(A) To save time, if the main laneahead is congested, you may temporarily drive on the shoulder to keep traffic flowing.
(B) If a vehiclebreaks down while driving, you should slowly move to the shoulder and stop, place a breakdown warningsign 50~100 meters behind the vehicle, and personnel should wait outside the guardrail for rescue.
(C)After an accident, to protect the vehicle and property, all passengers should remain inside the vehiclewith the doors locked until the tow truck arrives.

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