BOTH INTERNATIONAL & INLAND Which vessel would turn off its sidelights?

Correct Answer: Option C — a vessel that is not under command, not making way

Rule 23(a)(ii) mandates that a vessel not under command (NUC) shall exhibit sidelights and a sternlight only when making way through the water. If the vessel is NUC but not making way, it must extinguish its sidelights and sternlight, as it is no longer moving relative to the water.