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a,b,c are three vectors, such that a + b + c.=0, |a|= 1, |b| = 2 , |c| = 3, then a.b + b.c + c.a is equal to

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a,b,c are three vectors, such that a + b + c.=0, |a|= 1, |b| = 2 , |c| = 3, then a.b + b.c + c.a is equal to

(a) 0

(b) -7

(c) 7

(d) 1

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The correct option is (b) -7.

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