Which of the following is the correct Freundlich's formula?(w=weight of adsorbate, $m=$ mass of adsorbent)

The relation between the amount of the gas adsorbed (w) per unit mass of the adsorbent (m) and the pressure (p) is given by an isotherm known as the Freundlich’s isotherm.

According to the Freundlich’s adsorption isotherm,

$\frac{w}{m}=k{P}^{1/n}$ where $n\ge 1$            

Hence, option (A) is correct.