Final answer:
In volleyball, back-row players or any player behind the attack line cannot attack the ball when it is fully above net height from behind the line.
Step-by-step explanation:
In volleyball, players cannot complete an attack hit from behind the attack line if, at the moment of contact, the ball is entirely above the top of the net. This means back-row players, or any player behind the attack line, cannot jump and attack the ball above net height; they must jump from behind the line and make contact with the ball when it is not completely above the net.
This rule is in place to ensure fair play and maintain the integrity of the attacking and defensive strategies inherent to the game. However, back-row players can still participate in offensive plays by performing a back-row attack, where they start their jump from behind the attack line and hit the ball without reaching over the net.