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If `vec a, vec b, vec c` are unit vectors such that `vec a + vec b + vec c = vec 0`, then the value of `vec a . vec b + vec b.vec c + vec c vec a` is equal to

A

`vec a + vec b = vec c`

B

`vec a, vec b, vec c taken in order form the sides of a triangle

C

`vec b + vec c = vec a`

D

none of these

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The correct Answer is:
B
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HIMALAYA PUBLICATION-VECTORS AND THEIR APPLICATIONS-QUESTION BANK
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