An international and coastwise load line assignment and certificate has been issued to a vessel by the American Bureau of Shipping, under the authority of Coast Guard Regulations (46 CFR), for a period of __________.

Correct Answer: Option D — 5 years

International and coastwise load line certificates are issued under the authority of 46 CFR and the International Convention on Load Lines. These certificates are valid for a maximum period of five years, provided the vessel undergoes the required annual surveys to maintain compliance with established safety and structural standards.