Which curve represents Freundlich's adsorption isotherm?

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Freundlich adsorption isotherm is given by the expression $\frac{x}{m}=k{p}^{\frac{1}{n}}$ Which of the following conclusions can be drawn from this expression?

(a) When $\frac{1}{n}=0,$ the adsorption is independent of pressure
(b) When $\frac{1}{n}=0,$ the adsorption is directly proportional to pressure
(c) When n $=0,$$$x\over m$$vs p graph is a line parallel to x-axis
(d) When n = 0, plot of  $\frac{x}{m}$ vs p is a curve

The correct choice among the given is -
1. (a), (b)
2. (b), (c)
3. (c), (d)
4. (a), (c)