When a station officer is maintaining order on the platform, what should he or she do?
A.
Station officer should remind the passengers with a loudspeaker not to stand on the edge of the safer line while waiting for the train.
B.
Station officer should remind the passengers not to squat down on the platform for their own safety.
C.
Station officer should remind the passengers that leaning against the safety doors may endanger train operation.
D.
Station officer should organize passengers to line up behind the arrows on the ground if there are too many passengers waiting for the train.