The correct answer is D) All of the above. According to US Coast Guard regulations, any of the following persons may command a lifeboat in ocean service: 1) A credentialed deck officer, such as a merchant marine officer or Coast Guard licensed mariner. 2) An able seaman who has completed the required lifeboat training and has the necessary experience. 3) A certificated person, such as a crew member who has received the proper lifeboat command training and certification. The regulations do not restrict lifeboat command to a single category of personnel, but rather allow any of these qualified individuals to assume command of a lifeboat during ocean voyages.