What command is used to create a 3D model from 2D objects?

The command used to create a 3D model from 2D objects in AutoCAD is EXTRUDE. This command allows you to take a 2D shape or profile and extend it into the third dimension, effectively adding depth and creating a solid 3D object. This process is essential in 3D modeling as it transforms flat representations into tangible volume, enabling users to visualize and manipulate designs in three-dimensional space.

Using the EXTRUDE command, you can specify the height or the depth to which you want to extend the profile, thus providing flexibility in design. It is one of the fundamental operations in 3D modeling and is frequently used in architectural, mechanical, and product design applications to give life to 2D sketches. Other options presented do not serve the same purpose in creating 3D models from 2D drawings.