Please choose the correct ending to complete the given sentence: Tennis serve with ball bouncing: A man serves a tennis ball when playing tennis with a person in a tennis court. then

Ending1: , the man serves again to a person behind the net, while a player stands next to him. Ending2: , the man serves the ball continuing the volley. Ending3: , the man serves the ball with a racquet leg. Ending4: , the man serves the ball alone and then hits it against the wall.

Answer format: ending1/ending2/ending3/ending4