What is meant by the term "overhand serve"?

The term "overhand serve" refers specifically to a technique where the ball is struck above the head using one hand. This method involves throwing the ball into the air, and then making contact with it at a high point, generating power and spin. It is an essential skill in volleyball, as it allows players to serve with greater force and precision, often making it more challenging for the opposing team to receive the serve effectively.

The other options describe different aspects of serving but do not accurately capture the specific mechanics of an overhand serve. For example, serving with both hands or serving from behind the end line does not define the striking technique, while a serve characterized by a high arc pertains more to the trajectory of the ball rather than the mechanics of how it is hit. Only option C correctly focuses on the crucial feature of using one hand to hit the ball above the head, which is the hallmark of an overhand serve.