How should you signal the crane operator to stop?（）.<br>A:Place both fists in front of the body with the thumbs pointing outward<br>B:With both arms extended out and palms to down, move arms back and forth<br>C:Extend arm with the palm down and and hold this position rigidly<br>D:Clasp hands in front of you body

How should you signal the crane operator to stop?（）.
A:Place both fists in front of the body with the thumbs pointing outward
B:With both arms extended out and palms to down, move arms back and forth
C:Extend arm with the palm down and and hold this position rigidly
D:Clasp hands in front of you body

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