Please choose the correct ending to complete the given sentence: Tennis serve with ball bouncing: A person explains holding a racket and making moves with a racket in a tennis court. then a man wearing black clothes

Ending1: and what puzzles the young man is the racquet spinning a ball. Ending2: holds the tennis racket and spin around to hit a birdie. Ending3: talks to the jury. Ending4: serves a tennis ball that is returned, and he sends it back.

Answer format: ending1/ending2/ending3/ending4