How should you signal the crane operator to lower the boom and raise the load?（）.

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• How should you signal the crane operator to raise the boom and lower the load?（）.

  A . Extend arm with the palm down and and hold this position rigidly B . Place both fists in front of the body with the thumbs pointing outward each other C . Clasp hands in front of you body D . Extend arm with the thumb pointing up, and flex the finger s in and out for as long as the load movement is desired

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