The function defined by $f(x) = \begin{cases} |x - 3|, & x \ge 1 \\ \frac{1}{4}x^2 - \frac{3}{2}x + \frac{13}{4}, & x < 1 \end{cases}$ is

  • A
    Continuous at $x = 1$
  • B
    Continuous at $x = 3$
  • C
    Differentiable at $x = 1$
  • D
    All the above

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