You are configuring an EtherChannel between two switches for trunking. The EtherChannel will not form. You check your configuration on the first switch. What is the problem on the other switch? Refer to the following exhibit.

A. The other switch is configured as an access link.
B. The other switch has CDP turned off.
C. The other switch is configured for active mode.
D. The other switch is configured for passive mode.

D. If the other switch is set to passive mode, an EtherChannel will not form. The recommended mode for the other side is active mode.