BOTH INTERNATIONAL & INLAND A vessel displaying the day-shape shown in illustration D010RR below is which of the following?

Correct Answer: Option D — towing

COLREG Rule 24 specifies that a towing vessel whose tow length exceeds 200 meters must display a diamond day-shape. This visual signal indicates to other mariners that the vessel is encumbered by a long tow and possesses restricted navigational capabilities along its intended heading.