You are designing a strategy to upgrade the DHCP servers after the new Active Directory structure is in place. Who can authorize the DHCP servers?（）

A.Reverse lookup zones
B.Standard primary zones
C.Standard secondary zones
D.Active Directory-integrated zones

A.Create an Active Directory-integrated zone on DC4. Set the replication scope to all DNS servers in the domain.
B.Create an Active Directory-integrated zone on DC5. Set the replications scope to all DNS servers in the forest.
C.Create an Active Directory-integrated zone on any domain controller in the forest root domain. Set the replication scope to all domain controllers in the domain.
D.Create a standard primary zone on DC4.
E.Create a standard primary zone on any domain controller in the forest root domain. 

A.Upgrade the New York domain. Upgrade the Chicago domain. Create a pristine forest for Contoso, Ltd.
B.Create a pristine forest. Upgrade the New York domain. Upgrade the Chicago domain. Do nothing further.
C.Create pristine forest. Upgrade the New York domain. Upgrade the Chicago domain. Create a pristine forest for Contoso, Ltd.  
D.Create a pristine forest. Upgrade the New York domain. Upgrade the Chicago domain. Create a new child domain for Contoso, Ltd.