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.