Autodesk Certified User (ACU) Practice Test 2025 - Free ACU Practice Questions and Study Guide

The tool used to place images on selected models of a 3D body is the Decal tool. This tool allows users to apply a 2D image or graphic onto the surface of a 3D model, enhancing the visual representation by adding logos, textures, or other design elements. By utilizing the Decal feature, designers can project images accurately onto complex geometries, which is especially useful in product visualization or creating detailed prototypes.

Other options, while important in different contexts, do not serve this particular function. Dimensions relate to measurement and layout within a design rather than applying images, while Countersink is a feature used to create conical depressions for the heads of screws, impacting the geometry rather than its appearance. The Design Workspace refers to the general environment where modeling and designing take place, focusing more on the overall functionality rather than specific image placement capabilities. Thus, Decal is the best answer, as it directly addresses the task of overlaying images onto 3D models.