Domain of $f(x) = (x^2 - 1)^{-1/2}$ is
- A$( - \infty, -1) \cup (1, \infty)$
- B$( - \infty, -1] \cup (1, \infty)$
- C$( - \infty, -1] \cup [1, \infty)$
- DNone of these
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