BOTH INTERNATIONAL & INLAND The display of lights shown in illustration D048RR below could represent which of the following?

Correct Answer: Option B — tug and a barge being towed astern

Rule 24 lights displayed vertically on the mast—specifically multiple masthead lights above a towing light—indicate a power-driven vessel actively engaged in towing astern, where the length of the tow exceeds 200 meters or the towing operation restricts vessel movement.