As shown in the figure, this is an MPLS message with multiple layers of labels nested. Which of the following is the correct value of the S field at the three positions S1, S2, and S3?

As shown in the figure, this is an MPLS message with multiple layers of labels nested. Which of the following is the correct value of the S field at the three positions S1, S2, and S3?

A . S1=2, S2=1, S3=0
B . S1=1, S2=1, S3=0
C . S1=3, S2=2, S3=1
D . S1=0, S2=0, S3=1

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Answer: D