Let \( a, b, c b \) three vectors of magnitude 1,1 and 2 respectively. If \( a \times(a \times c...

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Let \( a, b, c b \) three vectors of magnitude 1,1 and 2 respectively. If \( a \times(a \times c)+b=0 \), then the acute angle between \( a \) and \( c \) is
(a) \( \frac{\pi}{3} \)
(b) \( \frac{\pi}{4} \)
(c) \( \frac{\pi}{6} \)
(d) \( \frac{\pi}{2} \)
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