Correct set among the followingA) Mg(HCO3)2 + 2Ca(OH)2 → 2CaCO3 + Mg(OH)2 + 2H2O : Clark’s methodB) M+2 + Na4P6O182– → [Na2MP6O18]2– + 2Na+ : Calgon’s methodC) 2NaZ + M+2 → MZ2 + 2Na+ : Ion exchange methodD) 2RNa + M+2 → R2M + 2Na+ : Synthetic resin method