A.Create a Stub Zone in each domain of the root zone.  
B.Create a _msdcs subdomain in a new zone on the root domain. 
C.Replicate the _msdcs subdomain across the roor domain.  
D.Replicate the _msdcs subdomain to the ForestDNS zone applciation partition.  
E.Configure a zone transfer of the _msdcs subdomain to secondary zone on all DNS servers in the forest.

A.Create a reverse lookup zone in DNS for each new Domain.
B.Add a WINS lookup record to the DNS forward lookup zone.
C.Add a WINS reverse record to the DNS reverse lookup zone.
D.Enable Dynamic updates for DownLevel client computers on each DHCP server.
E.Install the Active Directory Client on All Computers in the Customer service department.