The unit vector in the direction of \(\rm \vec a+\vec b\) if \(\vec a=2\hat i-\hat j+2\hat k \ \&\ \vec b=-\hat i+\hat j-\hat k\) is:
1
\(\rm \hat i+0.\hat j+\hat k\)
2
\(\rm \hat i-\hat j+\hat k\)
3
\(\rm \hat i+\hat j+\hat k\)
4
More than one of the above
5
None of the above