If $g$ is the inverse of $f$ and $f^{\prime}(x)=\frac{1}{1+x^{2}}$,then $g^{\prime}(x)$ is equal to

  • A
    $1+[g(x)]^{2}$
  • B
    $\frac{-1}{1+[g(x)]^{2}}$
  • C
    $\frac{1}{2(1+x^{2})}$
  • D
    None of these

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