Which vessel must exhibit red and green bowlights and an all-round white light when underway at night?

A sailing vessel under sail at night must exhibit red and green sidelights and an all-round white light when underway. The red light is displayed on the port side, and the green light on the starboard side, while the all-round white light indicates the vessel's presence and helps prevent collisions. This lighting configuration is essential for visibility and safety on the water.