Refer to the exhibit. What does the command channel-group 1 mode desirable do？ （） 
- A、enables LACP unconditionally
- B、enables PAgP only if a PAgP device is detected
- C、enables PAgP unconditionally
- D、enables Etherchannel only
- E、enables LACP only if a LACP device is detected
正确答案:C
答案解析:有
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