The correct answer is A: A group of licensed amateurs who have voluntarily registered their qualifications and equipment for communications duty in the public service. ARES (Amateur Radio Emergency Service) is a volunteer organization of licensed amateur radio operators who have registered their qualifications and equipment for providing communications support in public service situations. ARES is organized by the ARRL (American Radio Relay League) and operates at local, section, and national levels. ARES members volunteer to provide communications support during emergencies, public service events, and other situations where their skills are needed. Unlike RACES, ARES is not a government service but a volunteer organization that works with served agencies (like emergency management, Red Cross, etc.).