Which rule applies to the libero's actions during the serve?

The correct understanding revolves around the specific role of the libero in volleyball, particularly during serving situations. The libero is allowed to serve, but there are restrictions on how and when that can happen. Specifically, the libero can only serve in a designated position, which must be established before the match starts. This means that if the libero is allowed to serve, they must serve in the position that is identified for them within the rotation.

In the context of volleyball rules, this limitation ensures clarity in the game's structure and helps maintain the tactical elements of play. The rule reinforces the libero's specialized role on the team, separating their contributions in serve-receive and defense from standard play, while still allowing them a participation opportunity in serving.

This rule reflects the broader principle that while the libero has unique constraints, their involvement in serving during a match is managed to align with their primary responsibilities on the court.