Your company has an Active Directory domainnamed contoso.com.
The company networkhas two DNS serversnamed DNS1and DNS2.
The DNS servers are configured as shown in the following table.

Domain users, who are configured to use DNS2 as the preferred DNSserver, are unable to connect to
Internet Web sites.
You need to enable Internet name resolution for all client computers.
What should you do?

A.
Update the list of root hints servers on DNS2.

B.
Create a copy of the .(root) zone on DNS1.

C.
Delete the .(root) zone from DNS2. Configure conditional forwarding on DNS2.

D.
Update the Cache.dns file on DNS2. Configure conditional forwarding on DNS1.

Explanation:
http://support.microsoft.com/kb/298148
How To Remove the Root Zone (Dot Zone)
When you install DNS on a Windows 2000 server that does not have a connection to the Internet, the zone for
the domain is created and a root zone, also known as a dot zone, is also created. This root zone may prevent
access to the Internet for DNS and for clients of the DNS. If there is a root zone, there are no otherzones other
than those that are listed with DNS, and you cannotconfigure forwarders or root hint servers. For these
reasons, you may have to remove the root zone.