Under the IALA-B Buoyage System, when entering from seaward a lateral system buoy to be left to port may display which of the topmarks shown in illustration D046NG below?

Correct Answer: Option D — D

Under IALA-B, a port-hand lateral buoy is identified by a green color and a square topmark. This visual indicator allows mariners to distinguish the port side of the channel from the starboard side, which utilizes red colors and triangular topmarks, ensuring consistent navigation in restricted waterways.