Let $g(x)$ be the inverse of an invertible function $f(x)$ which is differentiable at $x = c$. Then $g'(f(c))$ equals:

  • A
    $f'(c)$
  • B
    $\frac{1}{f'(c)}$
  • C
    $f(c)$
  • D
    None of these

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