If the Length/type=0x8100 of an Ethernet data frame, which of the following statements is correct?

If the Length/type=0x8100 of an Ethernet data frame, which of the following statements is correct?
A . The upper layer of this data frame must have a UDP header
B. There must be a TCP header in the upper layer of this data frame
C. This data frame must carry VLAN TAG
D. The upper layer of this data frame must have an IP header

View Answer

Answer: C