If the roots of the equation $z^2-i=0$ are $\alpha$ and $\beta$,then $|\operatorname{Arg} \beta-\operatorname{Arg} \alpha|=$

  • A
    $2 \pi$
  • B
    $\frac{\pi}{2}$
  • C
    $\pi$
  • D
    $\frac{\pi}{4}$

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