Explanation: Compliance with regulations for certain maritime radio equipment, such as Global Maritime Distress and Safety System (GMDSS) installations, requires regular verification of operational integrity. Federal Communications Commission (FCC) rules, aligned with international SOLAS conventions, mandate that this critical safety equipment undergo an inspection at least once every 12 months. This ensures all components are fully operational and meet performance standards. The inspection must be performed by the FCC, an authorized agent, or a holder of a GMDSS Maintainer's license, who possesses the specialized knowledge and credentials for this task. This annual inspection is distinct from routine preventive maintenance and is a regulatory requirement to ensure the vessel's GMDSS equipment is always ready for emergency use. Other options, like five-year or no inspections, do not meet this annual safety standard.