Question 380 Deck Safety

The correct answer is D) vertical motion of the arms. The vertical motion of the arms is the signal used with shore lifesaving equipment to indicate "Affirmative" or agreement. This signal is specified in the International Code of Signals, which is the standard set of signals used for maritime communication. The vertical motion of the arms is a clear and simple visual signal that can be easily recognized from a distance, making it the appropriate choice for use with shore lifesaving equipment. The other answer choices are incorrect because they do not correspond to the established signaling protocol for shore lifesaving equipment. Firing a red star signal, or using a code signal "C" sent by light or sound, are not the recognized signals for indicating "Affirmative" in this context.