Your company has two offices. Each office is configured as a separate subnet. The network contains a single Active Directory domain. All servers run Windows Server 2003 Service Pack 2 （SP2）. All client computers run Windows XP Professional Service Pack 3 （SP3）. Users report that they are unable to resolve host names on the Internet. You verify that users can access all servers on both subnets.You need to ensure that users can resolve names on the Internet. The solution must ensure that users can access resources on the internal network. What should you configure？（）

A. all client computers to use the IP address of a DNS server on the Internet as the primary DNS server
B. all client computers to use the IP address of a DNS server on the Internet as the secondary DNS server
C. the internal DNS servers to use a forwarder
D. the internal DNS servers to use round robi