Which tool should you use?

Your network contains an Active Directory domain named contoso.com. The domain contains a domain
controller named DC5. DC5 has a Server Core Installation of Windows Server 2012 R2.
You need to uninstall Active Directory from DC5 manually.
Which tool should you use?

A.
The Remove-ADComputercmdlet

B.
The ntdsutil.exe command

C.
The dsamain.exe command

D.
The Remove-WindowsFeaturecmdlet

Explanation:
http://technet.microsoft.com/en-us/library/hh472163.aspx#BKMK_RemoveSM
http://technet.microsoft.com/en-us/library/cc732257.aspx#BKMK_powershell