Refer to the exhibit. A ping from R1 to 10.1.1.2 is successful, but a ping from R1 to any address in the 192.168.2.0 network fails. What is the cause of this problem?
- There is no gateway of last resort at R1.
- The serial interface between the two routers is down.
- A default route is not configured on R1.
- The static route for 192.168.2.0 is incorrectly configured.