Q 1470791616.     Find the shortest distance between the parallel lines `vec{r}=(vec{2i}-vec{j}-vec{k}) + t (vec{i}-vec{2j}+vec{3k})` and `vec{r}=(vec{i}+vec{2j}+vec{k}) + s (vec{i}-vec{2j}+vec{3k})`

A

`sqrt{frac{5}{2}}` units

B

`sqrt{frac{5}{3}}` units

C

`sqrt{frac{7}{2}} ` units

D

`sqrt{frac{3}{2}}` units

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