Which of the following statements is true about points in volleyball?

The statement that points can be scored by both teams regardless of who serves accurately reflects the scoring system used in volleyball, specifically the rally scoring system. In this system, every rally played results in a point being awarded, and it does not matter which team served. This rule enhances the competitive nature of the game and ensures that both teams have the opportunity to score points on every rally, creating more dynamic and engaging gameplay.

The other statements do not align with the rules of contemporary volleyball. The first statement inaccurately suggests that only the serving team can score points, which would restrict the flow and excitement of the game. The third statement incorrectly asserts that points are only awarded for successful blocks; in reality, points can be earned in various ways, including successful attacks, service aces, and receiving errors by the opponent. The fourth statement is also incorrect, as points can be scored in any set, not just limited to the first one. Thus, understanding the principle that both teams can score points is crucial for grasping the dynamics of volleyball.