Which salts are excessively dissolved to make temporary hard water...? Mcqs

Which salts are excessively dissolved to make temporary hard water...?

(A) CaSO4 and CaCl2

(B) KNO3 and KOH

(C) CaCO3 and Ca(OH)2

(D) Ca(HCO3)2 and Mg(HCO3)2