Which command will need to be added to External_A to ensure that it will take over if serial 0/0 on External_B fails？ （） 
- A、 standby 1 priority 130
- B、 standby 1 preempt
- C、 standby 1 track fastethernet 0/0
- D、 standby 1 track 10.10.10.1
正确答案:B
答案解析:有
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