What must happen after a fault is called during a rally?

When a fault is called during a rally in volleyball, a point must be awarded to the opposing team, and the nature of the fault needs to be signaled by the official. This procedure is essential for maintaining the flow of the game and ensuring that all players and spectators are aware of what transpired during the rally.

The act of signaling the fault serves multiple purposes: it provides clarity about the violation, helps in enforcing the rules consistently, and contributes to the overall fairness of the game. The recognition of the point being awarded is crucial for both teams, as it affects their score and strategy moving forward in the match.

Other options, such as players leaving the court, switching sides, or pausing for discussion, are not standard procedures following a fault and would disrupt the play and the game's rhythm if implemented instead of properly awarding points and signaling the error. This is why the correct answer revolves around recognizing the fault and the awarding of a point.