A. "The field indicates whether there are other labels behind the current label. 1: Yes; 0: No." — This is incorrect. It's the opposite.
B. "The 'S' field is 1 bit long in frame mode and 2 bits long in cell mode." — This is false. The 'S' field is always 1 bit long.
C. "The field indicates whether there are other labels behind the current label. 0: Yes; 1: No." — This is true.
D. "The 'S' field exists in each MPLS packet header." — This is true.
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