Please choose the correct ending to complete the given sentence: Tennis serve with ball bouncing: He moves the racket and ball up to demonstrate how to properly serve the ball, followed by him actually serving the ball in slow motion. the same shot

Ending1: is shown dragged through several times as the keeper waits to see if he missed it correctly. Ending2: is shown twice more while serving two times, which is followed by the score being shown. Ending3: is shown several more times to demonstrate how to properly perform this serve. Ending4: is then shown to serve and the result isn't the same as the previous shot.

Answer format: ending1/ending2/ending3/ending4