How is the Master or operator of a vessel required to keep the crew informed of the regulations concerning the discharging of garbage overboard?

Correct Answer: Option D — Keep placards prominently posted.

MARPOL Annex V and 33 CFR 151.59 mandate that operating vessels of 26 feet or more in length prominently display durability-tested placards notifying crew and passengers of strict garbage discharge prohibitions and limitations.