Explanation: The Vessel Traffic Service (VTS) is the correct term for the maritime traffic management system operated by the U.S. Coast Guard in designated congested port approaches and waterways. Its purpose is to enhance navigation safety, prevent collisions and groundings, and protect the environment from vessel-related accidents. VTS centers achieve this by monitoring vessel movements, providing navigational information, and issuing advisories or instructions to participating vessels, primarily communicating via VHF marine radio. Options A, C, and D are not recognized or existing U.S. governmental agencies or services for maritime traffic management. The VTS system is a critical component of maritime safety regulations, utilizing radio communication to manage vessel movements in high-risk areas.