The set of all values of $x$ and the set of all values of $a$ for which the real-valued function $f(x) = \sqrt{\log_a(x - [x])}$ is defined are respectively:

  • A
    $R - Z$ and $(0, 1)$
  • B
    $Z$ and $R - \{0, 1\}$
  • C
    $Z$ and $(1, \infty)$
  • D
    $R$ and $R$

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