Refer to the exhibit. What must be done on router RTA to ensure that EIGRP works effectively in a Frame Relay multipoint environment?（） 
- A、Issue the command bandwidth 224 on the physical interface.
- B、Issue the command bandwidth 56 on the physical interface.
- C、Issue the command bandwidth 224 on each subinterface.
- D、Issue the command bandwidth 56 on each subinterface.
正确答案:A
答案解析:有
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