If $z$ and $\omega$ are two non-zero complex numbers such that $|z\omega| = 1$ and $\text{arg}(z) - \text{arg}(\omega) = \frac{\pi}{2}$,then $\bar{z}\omega$ is equal to

  • A
    $1$
  • B
    $-1$
  • C
    $i$
  • D
    $-i$

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