Refer to the exhibit. Which statement is supported by the output?
- A static default route has been manually configured on this router.
- Summarization of routes has been manually configured.
- A default route is being learned through an external process.
- The route to 192.168.1.1 represents the configuration of a loopback interface.
Explanation: Viewing the exhibit reveals that a default route is being learned through an external process on serial interface S0/0/1.