What does the acronym ATC stand for?

The acronym ATC stands for Air Traffic Control. This term specifically refers to the service provided by ground-based controllers who coordinate and manage the movement of aircraft on the ground and in the airspace to ensure safe and efficient operation. Air Traffic Control involves communication between air traffic controllers and pilots, where controllers provide instructions related to altitude, speed, and route changes to ensure safe separation between aircraft.

The other options, while they contain relevant aviation terms, do not accurately represent the specific function and service denoted by the acronym ATC. The focus on "control" in Air Traffic Control emphasizes the responsibilities of ATC in guiding aircraft during various phases of flight, making it the correct definition for the acronym.