Refer to the exhibit. Which two of these accurately describe this router's supervisor redundancy status? （）(Choose two.) 
- A、both supervisors are active
- B、SSO redundancy is being used
- C、the second supervisor is unavailable
- D、the primary supervisor is unavailable
- E、the primary supervisor was reloaded nine seconds ago
正确答案:B,D
答案解析:有
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