On a re-serve, after the first referee's signal for serve, what requests may be recognized?

In volleyball, when a re-serve is signaled by the first referee, the action implies that the serving team is given another opportunity to serve due to an infraction or a fault that occurred on the initial serve. At this point, the focus is primarily on the serve itself, and the rules state that no additional requests—such as time-outs, changes in service order, or substitutions—are permitted once the first referee has signaled for the serve.

This regulation is in place to maintain the flow of the game and to ensure that the serving player can execute the serve without any interruptions or additional complications. It emphasizes the importance of the serve as a critical component of play, making it clear that everything else, including time-outs and substitutions, must wait until after the serve is successfully completed or another situation arises that allows for interruptions.

Each of the other options involves aspects of gameplay that typically require breaks in action, which is not the case during a re-serve situation, thereby validating that no requests can be recognized until the serve is processed.