Objective question in Functions

The inverse of the function f(x)=frac{{{e}^{x}}-{{e}^{-x}}}{{{e}^{x}}+{e}^{-x}}}+2 is given by a) {{log }_{e}}{{left( frac{x-2}{x-1} ight)}^{frac{1}{2}}} b) {{log }_{e}}{{left( frac{x-1}{3-x} ight)}^{frac{1}{2}}} c) {{log }_{e}}{{left( frac{x}{2-x} ight)}^{frac{1}{2}}} d) {{log }_{e}}{{left( frac{x-1}{x+1} ight)}^{-2}}