If veca=hati+hatj, vecb=hatj+hatk, vec c...

If `veca=hati+hatj, vecb=hatj+hatk, vec c hatk+hati`, a unit vector parallel to `veca+vecb+vecc`.

A

`2hati+2hatj+2hatk`

B

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

C

`((hati+hatj+hatk))/(2sqrt(8))`

D

`(veca+vecb+vec c)/(sqrt(3))`

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