Explanation: The Global Maritime Distress and Safety System (GMDSS) is an internationally agreed-upon set of procedures, equipment, and protocols used to ensure the safety of mariners and facilitate search and rescue operations. Its fundamental concept, as indicated by its name, is to automate and improve emergency communications in the maritime industry. GMDSS achieves this by integrating various communication technologies, including satellite communications (like Inmarsat), terrestrial radio systems (such as Digital Selective Calling or DSC, NAVTEX), and emergency beacons (EPIRBs, SARTs). The goal is to ensure that a distress alert is sent automatically and received by land-based rescue coordination centers and other vessels in the vicinity, regardless of the vessel's location, thereby significantly enhancing the chances of rescue. Option A is incorrect because while GMDSS *utilizes* and improves DSC procedures, DSC is a component of GMDSS, not its overarching fundamental concept. Option B is incorrect as GMDSS's primary focus is safety and distress, not routine commercial communication cost reduction. Option C is incorrect because collision avoidance systems (like AIS or radar) are distinct from GMDSS, which focuses on distress alerting and safety communications rather than real-time collision prevention between vessels.