Let $f: \mathbb{R} \rightarrow \mathbb{R}$ be a twice continuously differentiable function such that $f(0)=f(1)=f^{\prime}(0)=0$. Then:

  • A
    $f^{\prime \prime}(0)=0$
  • B
    $f^{\prime \prime}(c)=0$ for some $c \in (0, 1)$
  • C
    if $c \neq 0$, then $f^{\prime \prime}(c) \neq 0$
  • D
    $f^{\prime}(x) > 0$ for all $x \neq 0$

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