If one root of the quadratic equation $ax^2 + bx + c = 0$ is equal to the $n$th power of the other,then $(ac^n)^{1/(n+1)} + (a^nc)^{1/(n+1)} =$

  • A
    $-2b$
  • B
    $-b$
  • C
    $b-1$
  • D
    $b+1$

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