If $f$ and $g$ are differentiable functions such that $g'(a) = 2$ and $g(a) = b$,and if $f \circ g$ is an identity function,then $f'(b)$ has the value equal to:

  • A
    $2/3$
  • B
    $1$
  • C
    $0$
  • D
    $1/2$

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