How should you signal the crane operator to move slowly（）.<br>A:Use one hand to give any motion signal，and place the other hand motionless in front of the hand giving the motion signa<br>B:Extend arm with the thumb pointing up，and flex the fingers in and out for as long as the load movement is desired<br>C:First tap your elbow with one hand and then proceed to use regular signals<br>D:First tap the top of your head with your fist and then proceed to use regular signals

How should you signal the crane operator to move slowly（）.
A:Use one hand to give any motion signal，and place the other hand motionless in front of the hand giving the motion signa
B:Extend arm with the thumb pointing up，and flex the fingers in and out for as long as the load movement is desired
C:First tap your elbow with one hand and then proceed to use regular signals
D:First tap the top of your head with your fist and then proceed to use regular signals

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