Let $\alpha, \beta$ be the roots of the equation $x^2-\sqrt{2} x+2=0$. Then $\alpha^{14}+\beta^{14}$ is equal to

  • A
    $-64 \sqrt{2}$
  • B
    $-128 \sqrt{2}$
  • C
    $-64$
  • D
    $-128$

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