Let veca,vecb,vecc be unit such that vec...

Let `veca,vecb,vecc` be unit such that `veca+vecb+vecc=vec0`. Which one of the following is correct? (A) `vecaxxvecb=vecbxxvecc=veccxxveca=vec0` (B) `vecaxxvecb=vecbxxvecc=veccxxveca!=vec0` (C) `vecaxxvecb=vecbxxvecc=vecxxvecc!=vec0` (D) `vecaxxvecb, vecbxxvecc, veccxxveca` are mutually perpendicular

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