Please choose the correct ending to complete the given sentence: Tennis serve with ball bouncing: A short intro video appears with people playing various sports. The video then goes into tennis and a tennis player explaining his technique. there

Ending1: are keeps in a house where a person is constantly playing racket ball and his machine. Ending2: is text that appears on the screen describing various aspects of tennis, where it's played, the setup and rules. Ending3: 's a man standing behind a net standing next to others who talk as they shoulder bumping. Ending4: is then a demonstration of several rackets in a gym that leads into a player hitting the ball into the pins.

Answer format: ending1/ending2/ending3/ending4