In a VLAN Tag added to a frame header, the __________ is a 2 byte number that identifies a frame as tagged.

In a VLAN Tag added to a frame header, the __________ is a 2 byte number that identifies a frame as tagged.

A.
User_priority

B.
Canonical Format Indicator

C.
VLAN identifier

D.
Tag Protocol Identifier

E.
Tag Control information