If $x$ is a solution of the equation, $\sqrt {2x + 1}  - \sqrt {2x - 1}  = 1, \left( {x \ge \frac{1}{2}} \right)$ , then $\sqrt {4{x^2} - 1} $ is equal to 

  • [JEE MAIN 2016]
  • A

    $\frac{3}{4}$

  • B

    $\frac{1}{2}$

  • C

    $2\sqrt 2 $

  • D

    $2$

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