A network administrator needs to configure a router for a Frame Relay connection to a non-Cisco router. Which of the following commands will prepare the WAN interface for this connection?()
A、Router(config-if)# encapsulation frame-relay q933a
B、Router(config-if)# encapsulation frame-relay ansi
C、Router(config-if)# encapsulation frame-relay ietf
D、Router(config-if)# encapsulation frame-relay isl
E、None of the above