Which one of the following statements best describes how 802.1q incorporates VLAN information onto an Ethernet frame?
A . It uses a special EtherType to identify the Ethernet payload that contains the 802.1Q tag.
B . It inserts a 4-byte header after the source MAC address in the original Ethernet frame, which carries the VLAN information.
C . The VLAN information is identified in the Ethernet header Type/Length field.
D . It encapsulates the entire Ethernet frame and adds a 4-byte header before the destination MAC address which carries the VLAN information.
Answer: B