Please choose the correct ending to complete the given sentence: Using the rowing machine: A woman exercises at a machine. the camera

Ending1: man watches from behind. Ending2: pans at a horseback riding event, a horse and rider pass to the left. Ending3: pans to show her holding an elliptical, and showing how she uses the machine. Ending4: focuses on and features specific parts of the machine.

Answer format: ending1/ending2/ending3/ending4