Customer X has a hub-and-spoke Frame Relay network, with a central office and two branch
offices (RemoteA and RemoteB). Each location has only one physical link to the Frame Relay
cloud and RemoteB has a router that is not a Cisco router. Since the installation, there is no
connectivity between RemoteB and the central office. What is a possible solution to this issue?

A.
Because Frame Relay IETF encapsulation is only configurable at interface level, you must use
IETF encapsulation on all routers.

B.
This is not a possible scenario. A dedicated Frame Relay link to RemoteB is mandatory at the
central office.

C.
The router at RemoteB must be replaced by a Cisco router.

D.
Use Frame Relay IETF encapsulation on a per-VC basis on the central office router.

E.
There is a problem in the Frame Relay cloud, because Cisco routers are compatible with IETF
Frame Relay.