The solubility product of a salt ab is 1 * 10⁻⁸ * m² in a solution in which the concentration of a ions is 10³ m. The salt will precipitate when the concentration of b ions is kept

a) Below 10⁵ M
b) Above 10⁻⁵ M
c) Below 10⁻⁵ M
d) Above 10⁵ M