Explanation: The Global Maritime Distress and Safety System (GMDSS) was established under international conventions, notably the SOLAS (Safety of Life at Sea) convention and ITU Radio Regulations, to modernize and standardize maritime emergency communications. Its fundamental goal is to ensure that a distress alert from a ship is always received by shore search and rescue authorities and nearby vessels, and that ships receive crucial safety information. By integrating satellite and terrestrial radio communication systems like DSC, EPIRBs, SARTs, and Inmarsat, GMDSS significantly automates and improves the reliability and speed of distress alerting, search and rescue coordination, and the dissemination of maritime safety information across the globe for the commercial shipping industry. Option A is incorrect because while GMDSS greatly aids Search and Rescue (SAR) operations, primary control typically rests with shore-based rescue coordination centers, not the distressed vessels themselves. Option C misidentifies the system's focus; GMDSS prioritizes safety communications over routine company business, although some GMDSS equipment can also be used for general communications. Option D is inaccurate as effectiveness and reliability are paramount, but "inexpensive" is not a primary characteristic or purpose of the sophisticated GMDSS infrastructure, which can be quite costly.