Which shape shown in illustration D016RR below would be displayed by a mobile offshore drilling unit that is being towed more than 200 meters astern of a towing vessel?

Correct Answer: Option B — B

Under COLREG Rule 24 and associated Annex navigation light/shape requirements, a vessel or object being towed whose overall length exceeds 200 meters must exhibit a diamond shape during daylight hours to indicate an encumbered towing configuration.