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

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.