Your network consists of one Active Directory forest that contains one root domain and 22 child domains.
All domain controllers run Windows Server 2003.
All domain controllers run the DNS Server service and host Active Directory-integrated zones.
Administrators report that it takes more than one hour to restart the DNS servers.
You need to reduce the time it takes to restart the DNS servers.
What should you do?
A.
Upgrade all domain controllers to Windows Server 2008.
B.
Upgrade all domain controllers in the root domain to Windows Server 2008, and then set the functional level for the root domain to Windows Server 2008.
C.
Deploy new secondary zones on additional servers in each child domain.
D.
Change the Active Directory-integrated DNS zones to standard primary zones.