BOTH INTERNATIONAL & INLAND A vessel which is unable to maneuver due to some exceptional circumstance, shall show two red lights in a vertical line and which additional lights or shapes?

Correct Answer: Option A — when making way at night, sidelights and a stern light

Rule 27(a)(ii) states that a vessel not under command shall exhibit the lights prescribed in Rule 27(a)(i) (two red lights) and, when making way through the water, sidelights and a stern light. This ensures other vessels can determine the vessel's movement despite her inability to maneuver.