Please choose the correct ending to complete the given sentence: Tennis serve with ball bouncing: A man wearing a white shirt is holding a tennis racket. he

Ending1: starts hitting tennis balls with his tennis racket. Ending2: hits the ball on the wall. Ending3: begins to play the tennis racket against a green ball. Ending4: drops the tennis ball at practice, then he serves.

Answer format: ending1/ending2/ending3/ending4