What does the command "MIRROR" do in AutoCAD?

The command "MIRROR" in AutoCAD is designed to create a mirrored copy of selected objects. When using this command, you can define a mirror line about which the selected objects will be mirrored. This allows for the creation of symmetrical designs by duplicating the original object but flipping it across the specified axis. The original objects remain in place unless the user chooses the option to delete them after creating the mirror image. This functionality is particularly useful in drafting and design, as it saves time when making symmetrical shapes or designs.

The other options do not accurately describe the purpose of the MIRROR command. Locking objects, scaling, or deleting them are not functions of this command. Understanding how MIRROR works is crucial for efficiency and accuracy in AutoCAD, especially when dealing with complex designs where symmetry plays an important role.