Which of the following statements about the " 5 " field in the MPLS packet...

The field indicates whether there are other labels behind the current label. 0: Yes; 1: No.

The field indicates whether there are other labels behind the current label. 1: Yes; 0: No.

The " S " field exists in each MPLS packet header.

The " S " field is 1 bit long in frame mode and 2 bits long in cell mode.