Under the IALA-A Buoyage system, a buoy marking the starboard side of the channel when approaching from seaward may have a __________.

Correct Answer: Option A — triangular topmark

Under IALA Region A, the starboard side of a channel when entering from seaward is marked by green buoys. To enhance visibility, these buoys may be fitted with a triangular topmark. This visual indicator helps mariners distinguish the starboard side of the channel from the port side.