What describes how the 802.1Q protocol lactates the transmission of multiple Layer 2 networks on a single link?

What describes how the 802.1Q protocol lactates the transmission of multiple Layer 2 networks on a single link?
A. adds 802.1Q tag information between the source MAC address and the Ether Type/Length fields
B. encapsulates the frame inside an 802.1Q tunnel
C. adds 802.1Q tag information between the preamble and the destination MAC address
D. encapsulates the packet inside an 802.1Q tunnel
E. transparently directs packets based on 802.1Q tags inside the header

Answer: B

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