If $x$ is a solution of the equation $\sqrt{2x+1} - \sqrt{2x-1} = 1$ for $x \geq \frac{1}{2}$,then $\sqrt{4x^2-1}$ is equal to:

  • A
    $\frac{3}{4}$
  • B
    $\frac{1}{2}$
  • C
    $2\sqrt{2}$
  • D
    $2$

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