What are the units of Equilibrium equations $K_p$ and $K_c$ when $\Delta n_g < 0$ respectively ?

Question

(a) $ (atm)^{\Delta n_g} , (L mol^{-1})^{\Delta n_g} $

(b) $ (atm)^{\Delta n_g} , (mol L^{-1})^{\Delta n_g} $

(c) $ (atm) , (L)^{\Delta n_g} $

(d) $ (atm) , (L mol^{-1})^{\Delta n_g} $