The precipitate of ${\mathrm{CaF}}_2 \left({\mathrm{K}}_{\mathrm{sp}} = 1.7 \times {10}^{-10}\right)$ is obtained when equal volumes of the following are mixed

• A

  ${10}^{-4} \mathrm{M} {\mathrm{Ca}}^{2+} \mathrm{ion} \mathrm{and} {10}^{-4} \mathrm{M} {\mathrm{F}}^{-}$

• B

  ${10}^{-2} \mathrm{M} {\mathrm{Ca}}^{2+} \mathrm{and} {10}^{-3} \mathrm{M} {\mathrm{F}}^{-}$

• C

  ${10}^{-5} \mathrm{M} {\mathrm{Ca}}^{2+} \mathrm{and} {10}^{-3} \mathrm{M} {\mathrm{F}}^{-}$

• D

  ${10}^{-3} \mathrm{M} {\mathrm{Ca}}^{2+} \mathrm{and} {10}^{-5} \mathrm{M} {\mathrm{F}}^{-}$