Question 631 Deck General

The correct answer is A) Extend arm with fingers closed and point thumb upward. This hand signal is the standard and widely recognized signal for instructing a crane operator to raise the boom. It is specified in the International Code of Signals and the OSHA regulations for crane operations. Extending the arm with the thumb pointed upward provides a clear, unambiguous visual cue to the crane operator to lift the boom. The other answer choices describe different hand signals that are not the accepted standard for directing a crane operator to raise the boom. These alternative signals could lead to confusion or misinterpretation, which could result in unsafe crane operations.