BOTH INTERNATIONAL & INLAND A "head on" situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and __________.

Correct Answer: Option A — both sidelights and masthead light(s) are visible

Under Inland Navigation Rules, for the condition where 'A "head on" situation shall be deemed to exist at night when a power-driven vessel sees another power-driven vessel ahead and', the correct requirement is: 'both sidelights and masthead light(s) are visible'. This standard ensures clear navigational intent and collision avoidance.