Which of the following is NOT a responsibility of a line judge?

A line judge has specific responsibilities associated with monitoring the game, but monitoring player rotation order is not one of them. Instead, line judges focus on making calls related to the ball's position and play actions near the lines, including indicating when the ball touches the wall or ceiling, signaling when the ball touches the antenna, and indicating touches made by players when the ball goes out of bounds. These duties are crucial for ensuring fair play and maintaining the integrity of the game.

Monitoring player rotation order is typically the responsibility of the officiating crew, particularly the first referee, who oversees the entire match and ensures that players are adhering to the rules regarding rotations and substitutions. Therefore, since player rotation order is not in the purview of a line judge, this choice accurately reflects a task that is not their responsibility.