Please choose the correct ending to complete the given sentence: Sports and Fitness: [header] How to be a tennis ball boy [title] Understand what the job is. [step] So that you know what's going on, you're going to have to know some information on the basics of ball boy setup and rules. In a tennis match, there are normally 6 ball boys; 2 at the net and 1 in each corner.

Ending1: The ball boys at the net are positioned so that they each have a side. One at the left of the net, and one at the right. Ending2: All of these are dedicated to the play of basketball. If you don't know one of the players well, know the coach pretty well already, so you know what the game is about. Ending3: In some matches, there may be several pairs of match boys. Players will be chosen for height and athletic scores. Ending4: The position of the men on the sidelines at each corner of the court must be needed to compete. [title] Make sure you're comfortable with your ball boy position.

Answer format: ending1/ending2/ending3/ending4