Your network contains an Active Directory domain named contoso.com.
The domain contains a domain controller named dc1.contoso.com.
You discover that the Default Domain Policy Group Policy objects (GPOs) and the Default Domain Controllers
Policy GPOs were deleted.
You need to recover the Default Domain Policy and the Default Domain Controllers Policy GPOs.
What should you run?

A.
dcgpofix.exe /target:domain

B.
dcgpofix.exe /target:both

C.
gpfixup.exe /oldnb:contoso/newnb:dc1

D.
gpfixup.exe /dc:dc1.contoso.com

Explanation:
http://technet.microsoft.com/en-us/library/cc739095(v=ws.10).aspx