How does a referee indicate the team that will serve next?

A referee indicates the team that will serve next by extending one arm in the direction of the team. This clear and direct signal helps both players and spectators understand which team has the right to serve. The arm extension is unmistakable and visually communicates the referee's decision effectively.

The other choices may represent varying actions that a referee might take during a match, but they do not serve the specific purpose of indicating which team will serve next. Raising both hands above the head or pointing with two fingers could be interpreted as signaling other game-related information, while blowing the whistle twice typically indicates a temporary stop in play or a change in the match state, but not specifically which team serves next. Therefore, extending one arm toward the team is the most accurate and recognized signal for indicating the serving team.