If $z_1 = -\sqrt{3} + i$ and $z_2 = -\sqrt{3} - i$,then the principal amplitude of the complex number $\frac{z_1}{z_2}$ is

  • A
    $\frac{\pi}{3}$
  • B
    $\frac{5\pi}{6}$
  • C
    $-\frac{\pi}{3}$
  • D
    $\frac{5\pi}{3}$

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$I$: If $a$ and $b$ are positive real numbers,then $\sqrt{-a} \times \sqrt{-b} = \sqrt{ab}$
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Then:

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