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.   DNS1  DNS2   _msdcs.contoso.com  contoso.com  .(root)   _msdcs.contoso.com   contoso.com   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.