Let $S=(a3$abbb$).$ Which one of the following statements is not true?

Select one:

$3.in{S}^{**}$

b$.5^{**}$ contains all possible strings of a$\text{'}$s and b$\text{'}$s that have a length divisible by $3$

c$.$ aaabbbbbb $in$ S$*$

d$.$ bbbaaa $in$ S$*$

Clear my choice