The relation between $K_c$ and $K_p$ is

Question

$\begin{array}{1 1} (a)\; Kc = Kp (RT) \Delta n \\ (b)\; Kp = Kc (RT) \Delta n \\ (c)\; Kp = Kc (RT) \\ (d)\; Kp = Kc \end{array} $