The digital data is transmitted using AMI $($Alternate Mark Inversion$)$ line code. For a fragment of data strings, $101000000$

$11,$ chose the appropriate B$6$ZS code to replace the long string of zeros. Remark: consider the first bit in the sequence as a

positive

a$.0--0++$

b$.0-+0+-$

c$.0+-0-+$

d$.0++0=$