Explanation: Inmarsat-C SafetyNET™ is a crucial component of the Global Maritime Distress and Safety System (GMDSS). It is a global satellite-based broadcast service specifically designed to promulgate Maritime Safety Information (MSI) to ships at sea. This includes navigational warnings, meteorological warnings, ice reports, and search and rescue (SAR) information, ensuring vessels receive vital safety updates regardless of their location. NAVTEX (B) is incorrect because, while it promulgates MSI, it is a terrestrial medium-frequency radio system, not a satellite system. AMVER (A) is the Automated Mutual-Assistance Vessel Rescue system, a reporting system for vessel positions to aid in SAR coordination, not a system that broadcasts MSI. Inmarsat-M SES (D) refers to a general satellite communication terminal, not a dedicated broadcast service for MSI.