If veca=2hati-hatj+hatk and vecb=-2hati+...

If `veca=2hati-hatj+hatk` and `vecb=-2hati+hatj+2hatk`, then vector in the direction of `veca+vecb` with magnitude 9 is :

A

`9hatk`

B

`3hatk`

C

`hatk`

D

`6hatk`

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