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Find a unit vector perpendicular to each...

Find a unit vector perpendicular to each one of the vectors `vec a =4hati -hatj +3hatk and vecb =3 hati +2hatj -hatk`

A

`(-5 hati+13 hatj+11hatk)/(sqrt315)`

B

`(5hati-3hatj +12 hatk)/(sqrt215)`

C

`(-hati+5hatj+11hatk)/(sqrt305)`

D

`(hati+3hatj+5hatk)/(sqrt400)`

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The correct Answer is:
A
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