Explanation: SafetyNETTM is an international satellite-based service integral to the Global Maritime Distress and Safety System (GMDSS). It disseminates Maritime Safety Information (MSI), which includes navigational warnings, meteorological warnings, and search and rescue information, to mariners worldwide. These messages originate from authorized information providers, are transmitted via Land Earth Stations (LES) to Inmarsat geostationary satellites, and then broadcast to specific ocean regions (NAVAREAs/METAREAs). NAVTEX broadcasts (C) are incorrect because they use terrestrial MF (medium frequency) transmissions, not satellite links via LES, and have a more limited range. AMVER broadcasts (A) are a ship reporting system for search and rescue, not a general broadcast service for MSI. Urgency messages (B) are specific distress-related communications, usually initiated by vessels or coast stations, rather than routine MSI from general providers.