If the function $f(x) = \begin{cases} x - \frac{|x|}{x}, & x < 0 \\ x + \frac{|x|}{x}, & x > 0 \\ 1, & x = 0 \end{cases}$,then which of the following is true?

  • A
    $\lim_{x \to 0^{-}} f(x)$ does not exist
  • B
    $\lim_{x \to 0^{+}} f(x)$ does not exist
  • C
    $f(x)$ is continuous at $x = 0$
  • D
    $\lim_{x \to 0^{-}} f(x) \neq \lim_{x \to 0^{+}} f(x)$

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