What is the official rally scoring system in volleyball?

The official rally scoring system in volleyball allows for a point to be scored on every serve, regardless of which team serves. This means that either the serving team or the receiving team can earn a point on any rally that occurs, which contributes to a quicker and more dynamic pace of the game. This scoring system has been implemented to enhance the competitiveness of matches by ensuring that points are continuously contested, making it an integral part of modern volleyball play.

In contrast, the other options describe different scenarios that do not align with the official rally scoring rules. For example, having points scored only by the serving team would limit the game's dynamics and the opportunity for the receiving team to score. Similarly, restricting point scoring to only the final set or allowing points to be scored exclusively by the serving team contradicts the essence of rally scoring, which aims to keep every rally impactful in determining the outcome of the match.