The correct answer is D: All these choices are correct. According to FCC Part 97.3(a)(38), remote control requires all three elements: (1) the control operator must be at the control point (where control is exercised), (2) a control operator is required at all times, and (3) the control operator must indirectly manipulate the controls (not directly at the equipment location). Remote control allows operation when the control operator is not at the same location as the transmitting equipment, but the operator must still be actively controlling the station from the control point. The operator uses indirect means (like internet, radio link, or other methods) to control the station. All three requirements must be met for proper remote control operation.