To serve as a person in charge of transfer operations on board a self-propelled tanker，an individual must（）.<br>A:hold a valid officer's license for inspected vessels<br>B:be a certificated tankerman<br>C:be 30 years old<br>D:have a letter from the company stating his qualification

To serve as a person in charge of transfer operations on board a self-propelled tanker，an individual must（）.
A:hold a valid officer's license for inspected vessels
B:be a certificated tankerman
C:be 30 years old
D:have a letter from the company stating his qualification

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