What is the correct signal to show after awarding the ball to the opponent due to an illegal attack?

When awarding the ball to the opponent due to an illegal attack, the correct signal to use is the backrow attack signal. This signal indicates a specific violation regarding players in the back row executing attacks, particularly when they exceed the allowable limits for their position. The backrow attack signal helps to clarify the nature of the infraction to both the players and the spectators, ensuring that everyone understands the reasoning behind the decision. In this context, an illegal attack typically refers to a situation where a backrow player strikes the ball above the net height while not taking off from behind the attack line, which is a breach of the rules.

The other signals mentioned would not apply to illegal attack situations. For example, the net fault signal indicates a violation related to contact with the net during the play, while the back court signal is relevant for other aspects of play but does not specifically denote an illegal attack. The illegal attack signal, while it might seem appropriate at first glance, is not the correct one in this context as it may not differentiate between the various types of attacks or players involved.

Using the backrow attack signal ensures clarity in officiating and adherence to the rules regarding player positions and actions during the game.