If the position vectors of two given poi...

If the position vectors of two given points A and B be `4hati+hatj+2hatk` and `2hati-5hatj-hatk` respectively, then a unit vector in the direction of `vec(AB)` is -

`(1)/(7)(2hati+6hatj-3hatk)`

`(1)/(7)(-2hati-6hatj+3hatk)`

`(1)/(7) (2hati-6hatj+3hatk)`

`(1)/(7)(-2hati-6hatj-3hatk)`

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