The International Oil Pollution Prevention Certificate on a MODU is valid for a period of __________.

Correct Answer: Option D — four years from the date of issue

In accordance with MARPOL Annex I and 33 CFR 151.17, the International Oil Pollution Prevention (IOPP) Certificate is valid for a maximum period of four years from the date of issue, provided the vessel remains in compliance with all survey and inspection requirements mandated by the Coast Guard.