Let $f:[a, b] \rightarrow R$ be continuous in $[a, b]$, differentiable in $(a, b)$ and $f(a)=0=f(b)$. Then

  • A
    there exists at least one point $c \in(a, b)$ for which $f^{\prime}(c)=f(c)$
  • B
    $f^{\prime}(x)=f(x)$ does not hold at any point of $(a, b)$
  • C
    at every point of $(a, b), f^{\prime}(x)>f(x)$
  • D
    at every point of $(a, b), f^{\prime}(x) < f(x)$

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