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The officer's signal indicates:
AStart moving.
BReduce speed.
CMandatory stop.Correct
Explanation
The signal given by the authority officer, with the arm raised vertically and the palm of the hand facing forward, indicates a mandatory stop for all users approaching from the front. Signals for starting to move or reducing speed are represented by other regulatory gestures. Speed reduction, for example, is signaled through vertical oscillatory movements of the arm.
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