INTERNATIONAL ONLY Which is TRUE for the light which may be used with a vessel's whistle?

Correct Answer: Option D — It is a white light

Rule 34(b) allows a vessel to supplement her whistle signals with a light signal. This light must be an all-round white light, visible for at least five miles, and must be flashed in unison with the whistle blasts to provide a visual indicator of the vessel's current maneuvering actions.