545.Traffic officers use different hand gestures to signal stop or go to different directions. Which of thefollowing descriptions of hand signals is correct?
(A) One arm raised above the head: only vehicles fromthe front must stop; vehicles from other directions may proceed.
(B) One arm raised above the head: allvehicles from all directions must stop.
(C) One arm raised above the head: vehicles from the front andrear must stop; vehicles from the left and right may proceed.

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