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

Which two statements about 802.1Q are true? (Choose two.)
A . It encapsulates the original Ethernet frame and adds a VLAN identifier.
B . It increases the maximum size an Ethernet frame to 1094 bytes.
C . It adds a 32-bit field to the Ethernet frame between the source MAC address and length fields.
D . It supports 8-byte VLAN identifiers.
E . It is a Cisco proprietary protocol.
F . When It is enabled, it forces a recalculation of the frame check sequence field.

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Answer: CF