Please choose the correct ending to complete the given sentence: Tennis serve with ball bouncing: A man is bouncing a tennis ball on a court. he

Ending1: bounces it up and down on a pole several times. Ending2: bounces it back and forth on the ground. Ending3: serves the ball over the net. Ending4: is swinging back and forth on the racket.

Answer format: ending1/ending2/ending3/ending4