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A.two years
B.three years
C.four years
D.five years

A.annually by the owner，with a letter submitted six months before expiration
B.only once every five years，with a letter submitted six months before expiration
C.and the entire plan resubmitted for approval once every five years，six months before expiration
D.annually by the owner，with a letter submitted to the Coast Guard within one month of the anniversary date of the plan approval