Let veca, vecb ,vecc be unit vetors such...

Let `veca, vecb ,vecc` be unit vetors such that `veca + vecb + vecc = vec0` , which one of the following is correct ?

`vecaxxvecb=vecbxxvecc=veccxxveca=vec0`

`vecaxxvecb=vecbxxvecc=veccxxvecanevec0`

`vecaxxvecb=vecbxxvecc=vecaxxveccnevec0`

`vecaxxvecb,vecbxxvecc,veccxxveca` are mutually perpendicular.

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