Which two statements about 802.1Q are true? (Choose two.)

Which two statements about 802.1Q are true? (Choose two.)
A . The header is found within the Ethernet trailer.
B . Each frame contains a 12-byte VLAN identifier field.
C . When it is enabled, the minimum Ethernet frame size is 68 bytes.
D . It inserts a 4-bytes tag field to the Ethernet frame.
E . Trunking devices add an 8-byte VLAN tag to all VLAN packets.

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Answer: CD