REFER TO THE EXHIBIT. A NETWORK ADMINISTRATOR HAS CONFIGURED R1 AS...

19. Refer to the exhibit. A network administrator has configured R1 as shown, and all interfaces are functioning correctly. A

ping from R1 to 172.16.1.1 fails. What could be the cause of this problem?

The serial interface on R1 is configured incorrectly.

The default route is configured incorrectly.

The default-information originate command must be issued on R1.

Autosummarization must be disabled on R1.