For the function $f(x) = \left[ \frac{1}{[x]} \right]$, where $[x]$ denotes the greatest integer less than or equal to $x$, which of the following statements is true?

  • A
    The domain is $(-\infty, \infty)$
  • B
    The range is $\{0\} \cup \{-1\} \cup \{1\}$
  • C
    The domain is $(-\infty, 0) \cup [1, \infty)$
  • D
    The range is $\{0\} \cup \{1\}$

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