Refer to the exhibit. You have a Cisco router directly connected to a non-Cisco router via a leased T1 line. The service provider has validated that the T1 is operational. What should be completed for communications between routers to commence?

A.
Enable Frame Relay on both routers.

B.
Enable PPP encapsulation on both routers.

C.
Reload both routers.

D.
Configure a routing protocol on both routers.

E.
Reset the interface on both routers.