The value of $\theta $ satisfying the given equation $\cos \theta + \sqrt 3 \sin \theta  = 2,$ is

  • A

    $\frac{\pi }{3}$

  • B

    $\frac{{5\pi }}{3}$

  • C

    $\frac{{2\pi }}{3}$

  • D

    $\frac{{4\pi }}{3}$

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  • [KVPY 2018]