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If two vectors are given as veca = hati ...

If two vectors are given as `veca = hati - hatj + 2hatk` and `vecb = hati + 2hatj+hatk`, the unit vector perpendicular to both vec a and vec b is

A

`(-5hati + hatj + 3hatk) / sqrt 35`

B

`(5hat i + hat j - 3hat k) / sqrt 35`

C

`(3hat i - hat j - 3hat k) / sqrt 19`

D

`(-3hat i - hat j + 3hat k) / sqrt 19`

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