BOTH INTERNATIONAL & INLAND A vessel is being propelled both by sail and by engines. Under the Rules, the vessel is __________.

Correct Answer: Option D — a power-driven vessel

Under Inland Navigation Rules, for the condition where 'A vessel is being propelled both by sail and by engines. Under the Rules, the vessel is', the correct requirement is: 'a power-driven vessel'. This standard ensures clear navigational intent and collision avoidance.