In illustration D045NG below, a green-and-red banded daymark, with the uppermost band green, will have which of the following shapes?

Correct Answer: Option A — A

A green-and-red banded daymark with green on top indicates the preferred channel is to starboard. Per USCG standards, this is a square-shaped mark (A). The uppermost color identifies the primary channel, and the square shape confirms its status as a port-side lateral mark in the IALA-B system.