What restrictions apply to player movement after a successful free throw?

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After a successful free throw, the restrictions on player movement primarily concern the positions of players during the free throw attempt. Specifically, players cannot leave their designated positions until the free throw attempt is considered complete. This means that the players who are lined up along the free-throw lane must wait until the shooter has either made the basket or missed it before they can move freely. This rule is designed to maintain order and fairness in the game, ensuring that players do not gain an unfair advantage by encroaching too early on the rebound when the free throw is taken.

In contrast, players who are not in the lane can move about but are generally required to respect the outcome of the shot before actively engaging in play. The other choices either incorrectly state that players must remain completely still until a whistle is blown or require a referee's signal to move, which is not the case after a successful free throw since the play is essentially live once the shooter’s attempt is resolved.