Q 1307423388.     A line passes through the points with position vectors are `hat i+ hat j-2 hat k` and `hat i-3 hat j+ hat k` . The position vector of a point on the line which is at a unit distance from the first point is ?

A

`frac{1}{5}(hat i-4hat j+3hat k)`

B

`frac{1}{5}(6 hat i+ hat j-7 hat k)`

C

none of these

D

`frac{1}{5}(4 hat i+9 hat j-13 hat k)`

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