问题:
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.
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