Which of the following describes the function of the Vertex tool in Unity?

The Vertex tool in Unity is specifically designed for selecting and manipulating the individual vertex points of a 3D model. This tool allows artists and developers to make fine adjustments to the shape and form of models at a granular level, which is essential in tasks like sculpting, modifying meshes, and refining the overall design of 3D assets. By selecting vertex points, users can move, scale, or rotate them to achieve the desired geometry, making this tool vital for detailed modeling work.

Other options do not accurately represent the function of the Vertex tool. For instance, selecting multiple objects simultaneously pertains to grouping and selection tools rather than vertex manipulation. Modifying the texture of an object relates to material and shader properties, which is not the focus of the Vertex tool. Removing unused components from a model typically involves mesh cleanup and optimization practices, which again fall outside the specific manipulation of vertices. Thus, focusing on the capabilities of the Vertex tool highlights its unique role in 3D model editing within Unity.