Who checks the alternating possession arrow after the first possession of a live ball?

The correct answer is the non-active referee, as this individual is responsible for monitoring specific aspects of the game while the active referee focuses on the play. After the first possession of a live ball, the non-active referee checks the alternating possession arrow to ensure that the correct team will gain possession of the ball next during a jump ball situation.

This task is crucial for maintaining the flow of the game and ensuring that the rules are followed accurately, as the alternating possession arrow helps to keep track of which team is entitled to the ball when a jump ball situation arises. This responsibility is part of the non-active referee's role to assist in managing game logistics without interfering with the active play.