The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.<br>A:raise the boom<br>B:raise the hook<br>C:raise the boom and hook<br>D:check the boom stop

The signal man assisting a crane operator has his arm extended with his fingers closed and thumb pointing upward. This is the signal to（）.
A:raise the boom
B:raise the hook
C:raise the boom and hook
D:check the boom stop

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