What does the back row attack rule state?

The back row attack rule specifically indicates that back-row players, when attempting to hit the ball, must make sure they do not jump from in front of the attack line (often called the 10-foot line). If they do jump from in front of this line, the play is considered illegal. This rule is designed to maintain fairness in play and to regulate the positional responsibilities of players on the court. When a back-row player attacks from behind the line, they are allowed to jump and strike the ball, allowing them to participate more dynamically in the game.

Understanding this rule is crucial for players and coaches alike, as it helps clarify the roles and limitations of back-row players within the game's structure. The other options do not accurately describe the specifics of the back row attack rule.