Please choose the correct ending to complete the given sentence: Tennis serve with ball bouncing: A couple of people are on an indoor tennis court. they

Ending1: lob the ball back and forth, playing a game of tennis. Ending2: are both wearing wear as they are trying to make a birdie. Ending3: are hitting the balls onto the ground as they play. Ending4: are using various kinds of leashes.

Answer format: ending1/ending2/ending3/ending4