Under the regulations implementing MARPOL, a mobile offshore drilling unit is required to have an International Oil Pollution Prevention (IOPP) Certificate when the unit __________.

Correct Answer: Option C — engages in a voyage to a port of another country which is a party of MARPOL

Under USCG National Maritime Center examination standards, the accepted correct answer is: engages in a voyage to a port of another country which is a party of MARPOL.