Water obtained by purification with organic ion exchange resins is

• A

  Pure water

• B

  Free water only ${\mathrm{Ca}}^{2+}, {\mathrm{Mg}}^{2+} \mathrm{ions}$

• C

  Free from ${\mathrm{HCO}}_3^{-}, {\mathrm{SO}}_4^{2-} \mathrm{and} {\mathrm{Cl}}^{-}$ ions only

• D

  None of these