The set of angles btween $0$ & $2\pi $ satisfying the equation $4\, cos^2 \, \theta - 2 \sqrt 2 \, cos \,\theta - 1 = 0$ is

  • A

    $\left\{ {\frac{\pi }{{12}}\,\,,\,\,\frac{{5\pi }}{{12}}\,\,,\,\,\frac{{19\pi }}{{12}}\,\,,\,\,\frac{{23\pi }}{{12}}} \right\}$

  • B

    $\left\{ {\frac{\pi }{{12}}\,\,,\,\,\frac{{7\pi }}{{12}}\,\,,\,\,\frac{{17\pi }}{{12}}\,\,,\,\,\frac{{23\pi }}{{12}}} \right\}$

  • C

    $\left\{ {\,\,\frac{{5\pi }}{{12}}\,\,,\,\,\frac{{13\pi }}{{12}}\,\,,\,\,\frac{{19\pi }}{{12}}} \right\}$

  • D

    $\left\{ {\frac{\pi }{{12}}\,\,,\,\,\frac{{7\pi }}{{12}}\,\,,\,\,\frac{{19\pi }}{{12}}\,\,,\,\,\frac{{23\pi }}{{12}}} \right\}$

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