单项选择题

A.one primary zone
B.two primary zones  
C.one Active Directory-integrated zone that has the replication scope set to all DNS servers in the forest.
D.two Active Directory-integrated zones that have the replication scopes set to all DNS servers in the forest.
E.one Active Directory-integrated zone that has the replication scope set to all domain controllers in the domain.
F.two Active Directory-integrated zones that have the replication scopes set to all domain controllers in the domain.