An oceangoing ship of 6000 gross tons or above must be fitted with a standard discharge shore connection with dimensions outlined in Pollution Prevention Regulations (33 CFR) or be substituted with a __________.

Correct Answer: Option C — portable adapter that meets the same specification outlined in 33 CFR, Subchapter "O"

33 CFR 155.430 mandates that vessels of 6000 gross tons or more provide a standard shore connection for oily bilge water discharge. If the fixed connection is not used, a portable adapter meeting the specific flange dimensions and bolt patterns defined in the regulation must be available to ensure compatibility.