Which feature allows you to create motion paths for layer animation?

Motion Sketch is a feature in Adobe After Effects that enables users to create motion paths for layer animation by drawing a path with a mouse or stylus. This allows for a more intuitive and dynamic way to animate layers, as users can directly trace the desired motion on the Composition panel. Once the path is defined, After Effects generates keyframes along that path, which can then be further adjusted for timing and ease of motion. The ability to visually sketch a path gives animators greater control and flexibility, making it especially useful for creating complex animations that might be cumbersome to keyframe manually.

The other choices do not directly provide the functionality to create motion paths in the same intuitive manner. For instance, masking is primarily used for revealing or concealing parts of layers, while transform properties focus on altering an object's scale, position, rotation, and opacity. Null objects serve as control points to manage the transformations of multiple layers, but they do not inherently create motion paths by themselves. Therefore, Motion Sketch stands out as the dedicated tool for creating motion paths in After Effects.