The Testking Central and Remote offices are configured as shown below: The remote router can be successfully pinged from the central office but the remote users can't access the server at the central office.Based on the output above, what do you suspect is the cause of this problem?（）

• A、The Frame Relay PVC is down.
• B、The IP addressing on the Central/Remote serial link is incorrect.
• C、RIP routing information is not being forwarded.
• D、Frame Relay inverse-ARP is not properly configured.