Assertion: If `vecaxxvecb=veccxxvecd and vecaxxvecc=vecbxxvecd the (veca-vecd)` is perpendicular to `(vecb-vecc)`., Reason : If `vecp` is perpendicular to `vecq then vecp.vecq=0` (A) Both A and R are true and R is the correct explanation of A (B) Both A and R are true R is not te correct explanation of A (C) A is true but R is false. (D) A is false but R is true.