You are the network administrator for the ABC Company.
Your network consists of two DNS servers named DNS1 and DNS2.
The users who are configured to use DNS2 complain because they are unable to connect to
Internet websites.
The following table shows the configuration of both servers:

The users connected to DNS2 need to be able to access the Internet.
What needs to be done?

A.
Build a new Active Directory Integrated zone on DNS2.

B.
Delete the .(root) zone from DNS2 and configure Conditional forwarding on DNS2.

C.
Delete the current cache.dns file.

D.
Update your cache.dns file and root hints.

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 other zones other than those that are listed with
DNS, and you cannot configure forwarders or root hint servers. For these reasons, you may
have to remove the root zone.