Which is the correct relation between $[H^+]$ and $[OH^-]$ $(K_e$ $=$ $10^{-14})$?
a) $[H^+]$ $+$ $[OH^-]$ $=$ $K_e$ b) $[H^+]$ $+$ $[OH^-]$ $=$ $14$ c) $[H^+]\cdot[OH^-]$ $=$ $K_e$ d) $\frac{[H^+]}{[OH^-]}$ $=$ $K_e$
c) is correct , $[H^+]\cdot[OH^-]$ $=$ $K_e$