BOTH INTERNATIONAL & INLAND At night you observe a vessel ahead show three flashes of a white light. This signal indicates that the vessel ahead is __________.

Correct Answer: Option C — operating astern propulsion

Under Inland Navigation Rules, for the condition where 'At night you observe a vessel ahead show three flashes of a white light. This signal indicates that the vessel ahead is', the correct requirement is: 'operating astern propulsion'. This standard ensures clear navigational intent and collision avoidance.