According to Freundlich adsorption isotherm, which of the following is correct?

Freundlich isotherm states $\frac{x}{m}=k{P}^{1/n}$.At high pressure, $1/n=0$, so $\frac{x}{m}\propto P^0$ (independent of pressure).At low pressure, $1/n=1$, so $\frac{x}{m}\propto P^1$ (directly proportional).At intermediate pressure, it follows $\frac{x}{m}\propto P^{1/n}$ where $n>1$.Thus, all are correct for different ranges.