If the direction consines of a vector of...

If the direction consines of a vector of magnitude 3 are `(2)/(3) , (-a)/(3), (2)/(3), alpha gt 0`, then the vectors is

A

`2 hati +hatj + 2 hatk `

B

`2 hati - hatj + 2 hatk`

C

`hati + 2 hatj + 2 hatk`

D

`hati + 2 hatj - 2 hatk`

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The correct Answer is:

B

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