If $\sqrt{3}\left(\cos ^{2} x\right)=(\sqrt{3}-1) \cos x+1,$ the number of solutions of the given equation when $x \in\left[0, \frac{\pi}{2}\right]$ is

  • [JEE MAIN 2021]
  • A

    $1$

  • B

    $2$

  • C

    $3$

  • D

    $4$

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