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The main purpose of the “MIRROR” command in AutoCAD is to create a symmetrical copy of an object over a specified line, which serves as the mirror line. When this command is used, AutoCAD allows you to select the object you want to mirror and then specify the point or line that serves as the axis of reflection.

This functionality is particularly useful in design situations where symmetry is essential, such as architectural layouts, mechanical parts, or any designs where elements should be mirror images of each other. By using the MIRROR command, users can efficiently create accurate, symmetrical designs without having to manually redraw mirror images, saving time and ensuring precision.

The other options relate to different functionalities in AutoCAD. The command for duplicating an object does not necessarily maintain symmetry or require a mirror line. Rotating an object serves a different purpose—changing its orientation rather than creating a mirrored counterpart. Similarly, scaling an object pertains to resizing an object uniformly, which does not involve the reflective aspects of mirroring. Thus, the selection of creating a symmetrical copy aligns perfectly with the purpose of the MIRROR command.