What is the function of the “S bit” in the MPLS header?

What is the function of the "S bit" in the MPLS header?

What is the function of the "S bit" in the MPLS header?

A.
It is a service bit which when set indicates this label is active.

B.
It is a bottom of stack bit which when set indicated that this is not the last label in the stack.

C.
It is a bottom of stack bit which when set it indicates that this is the last label in the stack.

D.
It is a service bit which when set indicates this label is not active.



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