You are designing the DNS topology to meet the business and technical requirements.  Which DNS structure should you use?（）

• 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.