Which two statements about 802.1q are true? (Choose two)

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

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Answer: BC