The inverse of the function $y = \frac{10^x - 10^{-x}}{10^x + 10^{-x}}$ is

  • A
    $\frac{1}{2} \log _{10}\left(\frac{1+x}{1-x}\right)$
  • B
    $\frac{1}{2} \log _{10}\left(\frac{2+x}{2-x}\right)$
  • C
    $\frac{1}{2} \log _{10}\left(\frac{1-x}{1+x}\right)$
  • D
    $\frac{1}{2} \log _{10}\left(\frac{2-x}{2+x}\right)$

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