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What should be added in vector bara=3hat...

What should be added in vector `bara=3hati+4hatj-2hatk`to get its resultant a unit vector `hati`?

A

a)`-2hati-4hatj+2hatk`

B

b)`-2hati+4hatj-2hatk`

C

c)`2hati+4hatj-2hatk`

D

d)none of these

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