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The p oints O, A, B, C, D are such that ...

The p oints O, A, B, C, D are such that `bar(OA)= bar a,bar(OB) = bar b,bar(OC) = 2bar a + 3bar b` and `bar(OD) = bar a- 2 bar b` if `|bar a|=|3 bar b|` then the angle between `bar(BD)` and `bar(AC)` is (A) `pi` (B) `pi/2` (C) `pi/3` (D) `pi/6`

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