If $\alpha, \beta, \gamma$ are the roots of the equation $x^3 - x - 1 = 0$,then find the equation whose roots are $\frac{1}{\beta + \gamma}, \frac{1}{\gamma + \alpha}, \frac{1}{\alpha + \beta}$.

  • A
    $x^3 - x^2 + 1 = 0$
  • B
    $x^3 + x^2 - 1 = 0$
  • C
    $x^3 + x - 1 = 0$
  • D
    $x^3 - x + 1 = 0$

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