JEE Math Practice Question

The inverse function of f(x) = $${{{8^{2x}} - {8^{ - 2x}}} \over {{8^{2x}} + {8^{ - 2x}}}}$$, x $$ \in $$ (-1, 1), is :

1. A.$${1 \over 4}{\log _e}\left( {{{1 - x} \over {1 + x}}} \right)$$
2. B.$${1 \over 4}\left( {{{\log }_8}e} \right){\log _e}\left( {{{1 - x} \over {1 + x}}} \right)$$
3. C.$${1 \over 4}\left( {{{\log }_8}e} \right){\log _e}\left( {{{1 + x} \over {1 - x}}} \right)$$
4. D.$${1 \over 4}{\log _e}\left( {{{1 + x} \over {1 - x}}} \right)$$