1.

The position vectors of points A, B, C and D are \[A=3\hat{i}+4\hat{j}+5\hat{k},\,\,B=4\hat{i}+5\hat{j}+6\hat{k},\,\,C=7\hat{i}+9\hat{j}+3\hat{k}\] and \[D=4\hat{i}+6\hat{j}\] then the displacement vectors AB and CD are

A.                 Perpendicular   
B.                 Parallel
C.                 Antiparallel        
D.                 Inclined at an angle of \[\text{6}0{}^\circ \]
Answer» E.


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