Which of the following statements about the S field in the MPLS packet header is correct? (Multiple choice)

Which of the following statements about the S field in the MPLS packet header is correct? (Multiple choice)
A . Is there any other label after marking this label, 1 means yes, 0 means no
B . The S bit exists in each MPLS packet header.
C . Is there any other label after marking this label, 0 means yes, 1 means no
D . S bit has only 1 bit in frame mode and 2 bits in cell mode.

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Answer: BC