If `hat i+ hat j+ hat k`,`2 hat i+ 5 hat j`, `3 hat i+ 2 hat j- 3 hat k` and `hat i- 6 hat j- hat k ` are the position vectors of points A,B,C and D respectively, then find the angle between `vec AB` and `vec CD`. Are `vec AB` and `vec CD` collinear?

Options

A. `PhCOCH_3, PhCH_2COCH_3` and `PhCH_2COO^(-) K^(+)`
B. `PhCHO, PhCH_2CHO and PhCOO^(-) K^(+)`
C. `PhCOCH_3, PhCH_2CHO and CH_3COO^(-) K^(+)`
D. `PhCHO, PhCOCH_3 and PhCOO^(-) K^(+)`