Among the following statements
a) if two salts have equal solubility then their solubility products are equal
b) `BaSO_(4)` in more soluble in water than in dil `H_(2)SO_(4)`
c) When `KI` is added to `PbI_(2)` then the `[Pb^(2+)]` decreases
d) In any solution containing `AgCl`, the value of `[Ag^(+)][Cl^(-)]` is constant at constant temperature,