The correct answer is C: The location at which the control operator function is performed. According to FCC Part 97.3(a)(14), the control point is defined as the location where the control operator function is performed - where the operator actually controls the station, not where the equipment is located. This is important for remote control operations. If you're controlling a station over the internet from your home, your home is the control point, even though the transmitting equipment might be miles away. The control point is where the human operator makes decisions and controls the station, not where the radio equipment is physically located. This distinction allows for remote control operations while maintaining proper operator supervision.