What is the primary difference between the Purge and Overkill commands in AutoCAD?

$-$Purge is used to delete duplicate objects, while Overkill is used to remove unused elements such as layers and blocks.

$-$Purge removes unused objects and definitions from a drawing, while Overkill combines overlapping or duplicate objects into a single object.

$-$Purge and Overkill perform the same function, removing duplicate objects from a drawing.

$-$Purge is used to fix drawing performance issues, while Overkill manages drawing coordinates.