What Is the Equilibrium Constant Expression for the Dissolution of Solid

What is the equilibrium constant expression for the dissolution of solid calcium fluoride in water?

A) K_sp = [Ca²⁺][F?]
B) K_sp = [Ca²⁺]²[F?]
C) K_sp = [Ca²⁺][F?]²
D) $K_{\mathrm{sp}}=\frac{\left[\mathrm{Ca}^{2+}\right]\left[\mathrm{F}^{-}\right]^{2}}{\left[\mathrm{CaF}_{2}\right]}$
E) $K_{\mathrm{sp}}=\frac{\left[\mathrm{Ca}^{2+}\right]\left[\mathrm{F}^{-}\right]}{[\mathrm{CaF}]}$