BOTH INTERNATIONAL & INLAND An all-round flashing yellow light may be exhibited by which vessel?

Correct Answer: Option C — an air-cushion vessel

Rule 23(b) specifies that an air-cushion vessel, when operating in the non-displacement mode, shall exhibit an all-round flashing yellow light. This light serves as a distinctive warning signal to other mariners, distinguishing the vessel from standard power-driven craft while it is moving at high speeds.