In the following figure, \( O \) is the centre of the (V) circle and \( D, E \) and \( F \) are ...

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In the following figure, \( O \) is the centre of the
(V) circle and \( D, E \) and \( F \) are mid-points of \( A B, B O \) and \( O A \) respectively. If \( \angle D E F=30^{\circ} \), then find \( \angle A C B \).
(a) \( 30^{\circ} \)
(b) \( 60^{\circ} \)
(c) \( 90^{\circ} \)
(d) \( 120^{\circ} \)
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