INTERNATIONAL ONLY At night, you sight the lights shown in illustration D055RR below. What do the lights indicate?

Correct Answer: Option D — A tug with a tow alongside

Rule 24(c) of the COLREGS requires a power-driven vessel towing alongside to exhibit two masthead lights in a vertical line, sidelights, and a stern light. This configuration identifies the towing vessel and the presence of a tow, distinguishing it from other towing arrangements or vessel types.