Which of the following is an example of remote control as defined in Part 97?

According to FCC Part 97 rules, remote control means the control operator is at a control point located elsewhere than at the station transmitter, indirectly manipulating the controls. Operating a station over the internet is the perfect modern example of this, where your computer at home acts as the control point for a radio located miles away. Repeater operation is an example of 'automatic control,' not remote control. Controlling a model craft falls under 'telecommand' rules, which is a specific subset of operations distinct from the general definition of a remotely controlled amateur station.