Which of the following signals is primarily associated with satellite communication?

The correct choice is primarily associated with satellite communication because SATCOM, short for satellite communications, specifically refers to communication systems that utilize satellites to transmit data. This includes voice, video, and data communications that link remote locations to one another or to central nodes through the use of satellites orbiting the Earth.

While other options like GPS (Global Positioning System) are also related to satellite technology, they serve a different primary purpose, which is positioning and navigation rather than direct communication. The terms IF (Intermediate Frequency) and AM (Amplitude Modulation) are more related to specific methods of encoding and modulating signals, rather than being distinctive identifiers of satellite-based communication systems. Therefore, SATCOM stands out as the most relevant term associated explicitly with satellite communication.