A unit vector perpendicular to both hati...

A unit vector perpendicular to both `hati+hatj+hatk` and `2hati+hatj+3hatk` is

A

`(2hati-hatj-hatk)sqrt(6)`

B

`(2hati-hatj-hatk)/(sqrt(6))`

C

`2hati+hatj+hatk`

D

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

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