Which one of the following removes temporary hardness of water?

Temporary hardness is due to the presence of bicarbonates of Ca(II) and Mg(II). Temporary hardness is removed by adding lime water or milk of lime. This method is known as Clark's process. Removal of hardness is called softening of water. Ca(OH)₂ + Ca(HCO₃)₂ → 2CaCO₃↓ + 2H₂O