Your company has an Active Directory domain named contoso.com. The company network has two DNS servers named DNS1 and DNS2.  The DNS servers are configured as shown in the following table. Domain users， who are configured to use DNS2 as the preferred DNS server， are unable to connect to Internet Web sites.  You need to enable Internet name resolution for all client computers.  What should you do（）

• A、Create a copy of the .（root） zone on DNS1.
• B、Update the list of root hints servers on DNS2.
• C、Update the Cache.dns file on DNS2 Configure conditional forwarding on DNS1.
• D、Delete the .（root） zone from DNS2. Configure conditional forwarding on DNS2.