Which of the Following Equilibrium Constant Expressions Represents the Ionization $K_{W}=\left[\mathrm{H}^{+}\right]\left[\mathrm{OH}^{-}\right]$

Which of the following equilibrium constant expressions represents the ionization of water?

A) $K_{W}=\left[\mathrm{H}^{+}\right]\left[\mathrm{OH}^{-}\right]$
B) $K_{\mathrm{W}}=\frac{\left[\mathrm{H}^{+}\right]}{\left[\mathrm{OH}^{-}\right]}$
C) $K_{w}=\frac{\left[\mathrm{OH}^{-}\right]}{\left[\mathrm{H}^{+}\right]}$
D) K_W = ?log[H⁺]
E) K_W = ?log[OH?]