关于这题，有考过的同学帮忙验证下，到底是选B还是选C

eyesforever

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 an LACP device is detected

小乔

按照题库给的答案