At a certain temperature, the solubility of cadmium fluoride, CdF2, is 0.073 mol/L. Calculate its solubility product constant for this temperature.
a) 1.43 × 10⁻4
b) 6.75 × 10⁻5
c) 1.31 × 10⁻5
d) 2.64 × 10⁻6