Let $f(x) = \min \{x, x^2\}$ for every real number $x$. Then:

  • A
    $f(x)$ is continuous for all $x$
  • B
    $f(x)$ is differentiable for all $x$
  • C
    $f'(x) = 2$ for all $x > 1$
  • D
    $f(x)$ is not differentiable at three values of $x$

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