If z and w are two complex numbers such that |zw| = 1 and arg(z) – arg(w) = ${\pi \over 2}$ , then :

Question

$z\overline w = {{1 - i} \over {\sqrt 2 }}$

$\overline z w = i$

$z\overline w = {{ - 1 + i} \over {\sqrt 2 }}$

$\overline z w = -i$

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