If the functions are defined as $f(x) = \sqrt{x}$ and $g(x) = \sqrt{1-x}$,then what is the common domain of the following functions: $f+g, f-g, f/g, g/f, g-f$ where $(f \pm g)(x) = f(x) \pm g(x)$ and $(f/g)(x) = \frac{f(x)}{g(x)}$?

  • A
    $0 \leq x \leq 1$
  • B
    $0 \leq x < 1$
  • C
    $0 < x < 1$
  • D
    $0 < x \leq 1$

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