The domain of the function $f(x) = \frac{1}{\sqrt{[x]^2 - [x] - 2}}$ is, where $[x]$ denotes the greatest integer function.
- A$(-\infty, -1) \cup [3, \infty)$
- B$(-\infty, -2) \cup (0, \infty)$
- C$(-\infty, -2) \cup (2, \infty)$
- D$(-\infty, -1) \cup (3, \infty)$
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