.Users on the LAN are unable to access the Internet. How would you correct the immediate problem?
Router# show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet 0/0 unassigned YES unset down down
FastEthernet 0/1 172.16.1.254 YES NVRAM up up
Serial0/0 22.214.171.124 YES NVRAM administratively down down
Serial0/1 unassigned YES unset down down
A. Configure a bandwidth on the serial interface.
B. Perform a no shutdown command on the serial interface.
C. Configure a private IP address on the Fastethernet0/0 LAN interface.
D. Change the IP address on the serial interface.