Question 634 Deck General

The correct answer is D) Extend arm and move hand rapidly right and left with the palm down. This is the correct answer because the standard hand signal for an emergency stop is to extend the arm out with the palm facing down, and then move the hand rapidly right and left. This is a clear, unambiguous signal that the crane operator can easily recognize as an emergency stop command. The other answer options are incorrect because they do not match the standard emergency stop hand signal. Option A (extend arm with palm down) is part of the correct signal but does not include the rapid side-to-side motion. Options B (clasped hands) and C (fists with thumbs out) are not recognized crane operation hand signals.