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A paragraph has been given. Based upon t...

A paragraph has been given. Based upon this paragraph, 3 multiple choice question have to be answered. Each question has 4 choices a,b,c and d out of which ONLYONE is correct. Consider the `L_1:(x+1)/3=(y+2)/1=(z+1)/2 and L_2:(x-2)/1=(y+2)/2=(z-3)/3` The unit vector perpendicular to both `L_1 and L_2` is (A) `(-hati+7hatk+7hatk)/sqrt(99)` (B) `(-hati-7hatk+5hatk)/(5sqrt(3))` (C) `(-hati+7hatk+7hatk)/(5sqrt(3))` (D) `(7hati-7hatk-7k)/sqrt(99)`

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