Let veca, vecb and vecc be three units v...

Let `veca, vecb and vecc` be three units vectors such that `3veca + 4vecb + 5vecc =0`. Then which of the following statements is true ?

`veca` is parallel to `vecb`

`veca` is perpendicular to `vecb`

`veca` is neither parallel nor perpendicular to `vecb`

None of these

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