When fire detecting systems, fire extinguishing systems, and associated equipment are not required by the Coast Guard but are installed on a cargo vessel at the option of the vessel's owner, they __________.

Correct Answer: Option D — must also be inspected and/or tested in accordance with Coast Guard Regulations at each Inspection for Certification

Any fire safety equipment installed on a vessel, even if voluntary, becomes part of the ship's safety certification. 46 CFR requires these systems to be maintained and tested in accordance with Coast Guard regulations during the Inspection for Certification to ensure they remain fully functional and reliable for emergency use.