Which one of the following gives a straight line for Freundlich adsorption isotherm?

Question

$\begin {array} {1 1} (1)\;log\large\frac{x}{m}Vs.log\: P & \quad (2)\;\large\frac{x}{m}Vs.\large\frac{1}{P} \\ (3)\;log\large\frac{x}{m}Vs.log\large\frac{1}{P} & \quad (4)\;\large\frac{x}{m}Vs.P \end {array}$