Which of these actions should follow the signal "Set Brakes"?

The action that follows the signal "Set Brakes" is to confirm that the brakes are engaged. This procedure is essential for ensuring the safety of ground operations around the aircraft. By confirming that the brakes are properly engaged, ground personnel can ensure that the aircraft remains stationary, preventing any accidental movement that could pose risks to loading operations, boarding, fueling, or any other activities that occur while the aircraft is on the ramp.

It's crucial to establish this safety measure before proceeding with additional tasks. Only once the brakes are confirmed to be engaged can other teams safely start their work in or around the aircraft. This systematic approach minimizes the possibility of accidents and enhances coordination among ground crews.