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a cdot hati = a cdot (2hati + hatj) = a ...

`a cdot hati = a cdot (2hati + hatj) = a cdot (hati + hatj + 3 hatk) = 1`then a is equal to

A

`hati - hatj`

B

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

C

`(hati + hatj + hatk)/3`

D

`(3hati - 3hatj + hatk )/3`

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The correct Answer is:
D
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