BOTH INTERNATIONAL & INLAND Which statement is TRUE of a 30-meter sailing vessel underway?

Correct Answer: Option D — She must show sidelights and a stern light in restricted visibility.

Under Inland Navigation Rules, for the condition where 'Which statement is TRUE of a 30-meter sailing vessel underway', the correct requirement is: 'She must show sidelights and a stern light in restricted visibility.'. This standard ensures clear navigational intent and collision avoidance.