Bill is learning to play tennis. He does pretty well hitting the ball back to his opponent but, many times he misses the ball when he tries to hit it on his serve. How can he improve his success rate of striking the ball every time on his tennis serve?

Hold the ball and toss it with his dominant hand
Place his feet parallel to the baseline prior to tossing the ball
Toss the ball gently into the air prior to striking it with the racquet
Use a wooden racquet instead of an aluminum racquet