What determines when a player's ball is out of bounds?

A player's ball is considered out of bounds when the entire ball has crossed the line of out-of-bounds marking. This is a fundamental rule in golf that ensures clarity regarding the boundaries of the course. The line of out-of-bounds is typically marked by white stakes or lines, and the key point is that the whole ball must be beyond this line for it to be deemed out of play.

Other options do not accurately reflect the criteria for determining out of bounds. For instance, the speed of the ball or its rolling status has no bearing on whether the ball is in or out of bounds; the position of the ball in relation to the course boundary is the only factor that matters. Thus, the clear guideline of the whole ball needing to cross the out-of-bounds line is the correct indicator for this scenario.