Which of the following is TRUE when the explicit null is implemented?

Which of the following is TRUE when the explicit null is implemented?
A . The penultimate router will forward packets to the eLER, based on the IP header.
B . The eLER will receive packets with a top label value of 0.
C . The eLER will receive packets with a top label value of 3.
D . The penultimate router will pop the top label from the packets.

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Answer: B