All servers in your environment run Windows Server 2003. Your companys network includes multiple network segments and multiple routers. A member server that has the Routing and Remote Access service （RRAS） installed provides Internet connectivity for all client computers. The RRAS server is located in a perimeter network （also known as DMZ）. A client computer named Client1 is unable to connect to the Internet. The RRAS server is able to connect to the Internet. You need to pinpoint the location of the network issue. What should you do？（）

A. Use the nbtstat command-line tool on Client1.
B. Use the pathping command-line tool on Client1.
C. Run the nbtstat -r command on the RRAS server.
D. Run the ping -a Client1 command on the RRAS server.