If $f(x) = \begin{cases} x, & 0 \le x \le 1 \\ 2x - 1, & x > 1 \end{cases}$,then

  • A
    $f$ is discontinuous at $x = 1$
  • B
    $f$ is differentiable at $x = 1$
  • C
    $f$ is continuous but not differentiable at $x = 1$
  • D
    None of these

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