Hardness of water can be temporary or permanent. Wrong Match about removal of hardness of water among the following is

• A

  Clarke’s process ………  ${\mathrm{Na}}_2{\mathrm{CO}}_3$

• B

  Calgon process …….  ${\mathrm{Na}}_2\left[{\mathrm{Na}}_4{\left({\mathrm{PO}}_3\right)}_6\right]$

• C

  Permutit process …….. ${\mathrm{NaAlSiO}}_4.{\mathrm{xH}}_2\mathrm{O}$ 

• D

  Ionic exchange process …..  $\mathrm{RCOOH} \& {\mathrm{RNH}}_3^{+}{\mathrm{OH}}^{-}$