What happens to your strokes when drawing on a bitmap layer?

When drawing on a bitmap layer, strokes are rasterized and ultimately flatten into a single image or object. This means that once you've created your strokes, they can't be individually manipulated or edited as separate entities; instead, they become part of a flat image. This is a key characteristic of bitmap graphics, which are pixel-based. Unlike vector graphics, where paths and strokes can remain distinct and editable, bitmap layers consolidate all drawing into a single, unified object, providing a final appearance but limiting further editing capabilities.

The other options suggest ways of maintaining separateness or enhancing the quality of the strokes, which do not apply to bitmap layers in this context. Instead, the nature of bitmap drawing inherently leads to the merging of strokes into a singular, non-editable formation.