Refer to the exhibit.<br />  What does the command channel-group 1 mode desirable do? ()<br /> <img src="https://nimg.ppkao.com/2018-07/gelingxia/2018073109243663160.jpg?sign=e4849b7b83f7e130f98a2dc7d1e66350&t=62d4aafe" /><br />  
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