What is the method for removing a domain controller in windows server 2012 r2?

Basically, you're going to use the Remove Roles and Features wizard.  However, there's a few more commands you can log into your computer to remove the controller as well.  You can use the dcpromo.exe command, the adprep.exe command, and then you can also alter the domain controllers through ADD roles and features wizard.

Kpa - known-plaintext attack