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

  • [AIEEE 2003]
  • A

    $1$

  • B

    $-1$

  • C

    $i$

  • D

    $-i$

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