If $x=(\sqrt{2}-1)^{-1/2},$ then the value of $\left(x^{2}-\frac{1}{x^{2}}\right)$ is

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

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