Autodesk Certified Professional in AutoCAD for Design and Drafting Practice Exam

The command that allows the user to create a three-dimensional object in AutoCAD is the EXTRUDE command. This command takes a two-dimensional shape and extends it into the third dimension, creating a solid object. For instance, if you have a circle or rectangle drawn on a plane, by using the EXTRUDE command, you can pull that shape upwards or downwards to form a cylinder or a prism, respectively.

EXTRUDE is particularly useful because it offers control over the height and direction of the extrusion, allowing for the creation of complex 3D geometries based on simple 2D profiles. This command is fundamental in 3D modeling and is one of the primary ways to transition from 2D sketches to 3D forms in AutoCAD.

Other choices do not specifically serve the purpose of directly creating 3D objects in the same functional way. For instance, 3DOBJECT and THREE-D are not recognized commands in AutoCAD for creating 3D models, and while SHAPE can refer to creating a 2D representation or a preset shape, it does not accomplish the task of forming a 3D object.