Let \( O \) be the origin and \( A \) and \( B \) be two points in the Argand plane such that \(...

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Let \( O \) be the origin and \( A \) and \( B \) be two points in the Argand plane such that \( O, A, B \) are collinear and \( O A . O B=1 \). If the affix of \( B \) is \( z \), then the affix of \( A \) is
(A) \( \frac{1}{z} \)
(B) \( \bar{z} \)
(C) \( \frac{1}{\bar{z}} \)
(D) none of thes
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