Which statement about using native VLANs to carry untagged frames is true?

A.
Cisco Discovery Protocol version 2 carries native VLAN information, but version 1 does not.

B.
Cisco Discovery Protocol version 1 carries native VLAN information, but version 2 does not.

C.
Cisco Discovery Protocol version 1 and version 2 carry native VLAN information.

D.
Cisco Discovery Protocol version 3 carries native VLAN information, but versions 1 and 2 do not.

Explanation:
Cisco Discovery Protocol (CDP) version 2 passes native VLAN information between Cisco switches. If you have a native VLAN mismatch, you will see CDP error
messages on the console output.
http://www.ciscopress.com/articles/article.asp?p=29803&seqNum=3