Your network contains an Active Directory domain. The domain contains several domain  controllers.  <br /> All domain controllers run Windows Server 2008 R2.  <br /> You need to restore the Default Domain Controllers Policy Group Policy object (GPO) to the  Windows Server 2008 R2 default settings.    <br /> What should you do()
A、Run dcgpofix.exe /target:dc.
B、Run dcgpofix.exe /target:domain.
C、Delete the link for the Default Domain Controllers Policy, and then run gpupdate.exe /sync.
D、Delete the link for the Default Domain Controllers Policy, and then run gpupdate.exe /force.