When a VLAN port configured as a trunk receives an untagged frame, what will happen?

A.
The frame will be dropped.

B.
The frame will cause an error message to be sent.

C.
The frame will be processed as a native VLAN frame

D.
The frame will first be tagged, then processed as a native VLAN frame.

Explanation:
If a switch receives untagged frames on a trunk port, they are assumed to be part of the
VLAN that are designated on the switchport as the native VLAN.