What requirement must a bowl meet to not be considered a line bowl?

A bowl is considered a line bowl if it crosses the boundary between the playing area and outside the rink. For a bowl to not be classified as a line bowl, it is essential that at least a part of the bowl remains within the designated playing area, known as the rink. This ensures that the bowl has completed its trajectory within the valid playing space, allowing it to contribute effectively to the game. If any part of the bowl goes outside the rink's limits, it can be deemed a line bowl, which would therefore invalidate its status.

The other options do not accurately define the requirements for a bowl to not be considered a line bowl. For example, whether a bowl is over a specific line upon approaching the end or whether it must land on a specific line after play does not directly relate to its classification as a line bowl. Similarly, the interaction with other bowls, such as touching them, does not determine its status as a line bowl. The critical aspect remains the position of the bowl in relation to the boundaries of the rink.