A daymark used to indicate the starboard side of the channel when approaching from seaward will have the shape indicated by what letter in illustration D045NG below?

Correct Answer: Option D — D

In the IALA-B system, starboard-hand daymarks are triangular and colored green. Illustration D045NG depicts various shapes; the triangle (D) is the standard daymark shape for the starboard side of a channel when approaching from seaward, as defined in the USCG Navigation Center's guidance on aids to navigation.