What does the 'Mirror' command do in a sketch?

The 'Mirror' command in a sketch is used to create a symmetrical counterpart of a selected sketch entity across a defined axis. This means that if you have a line, shape, or any other sketch feature that you want to replicate on the opposite side of an axis, the mirror command effectively duplicates it, maintaining the same distance from the axis but in the opposite direction. This is particularly useful in design scenarios where symmetry is essential, allowing for efficient modeling without the need to redraw identical features.

By specifying an axis of reflection, users ensure that the mirrored entity retains the original's dimensions and relations, thus preserving the design intent. This command streamlines the process of creating balanced designs, especially in mechanical components and parts that require symmetry. The other choices do not accurately reflect the function of the mirror command, as they involve different transformations like random flipping, rotating around a point, or resizing entities, which are not characteristics of the mirroring process.