Which two of these are characteristics of the 802.1Q protocol? (choose two)

Which two of these are characteristics of the 802.1Q protocol? (choose two)
A . it is a layer 2 messaging protocol which maintains vlan configurations across network.
B . it includes an 8-bit field which specifies the priority of a frame.
C . it is used exclusively for tagging vlan frames and dose not address network reconvergence following switched network topology changes.
D . it modifies the 802.3 frame header, and thus requires that the FCS be recomputed.
E . it is a trunking protocol capable of carring untagged frames.

Answer: DE