Quiz - Protesting a boat

* 1. During a race, Boat A is on a starboard tack and Boat B is on port tack. They are on converging courses. Boat A hails "starboard", but Boat B does not change course. At the last minute, to avoid a collision, Boat A changes course by ducking under Boat B. To inform the other boat of the protest, Boat A must: (You may select more than one answer)