What does the "MIRROR" command do?

The "MIRROR" command in AutoCAD is designed specifically to create a mirror image of selected objects. When this command is invoked, users can select the objects they wish to mirror, then specify a mirror line, which acts as the axis for the reflection. As a result, the command takes the original objects and generates a new set of objects that are symmetrical, effectively flipping them over the specified axis.

This is particularly useful in design scenarios where symmetry is important, allowing for efficient duplication of complex shapes without needing to redraw them. The mirrored objects can also be modified independently after they've been created, further enhancing design flexibility.

The other choices deal with functions that do not represent the primary purpose of the MIRROR command. For example, duplicating objects is akin to using the COPY command, which creates an exact replica without altering the original orientation. Rotating objects would involve the ROTATE command, which pivots objects around a specific point rather than reflecting them. Flipping the drawing vertically is more aligned with a display option than a command that generates geometric shapes based on symmetrical properties.