If the average of $x$ and $\frac{1}{x} (x \neq 0)$ is $M$,then the average of $x^{2}$ and $\frac{1}{x^{2}}$ is

  • A
    $1-M^{2}$
  • B
    $1-2M$
  • C
    $2M^{2}-1$
  • D
    $2M^{2}+1$

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