The unit vector parallel to the resultant of the vectors $\vec A = 4\hat i + 3\hat j + 6\hat k$ and $\vec B = - \hat i + 3\hat j - 8\hat k$ is
- A$\frac{1}{7}(3\hat i + 6\hat j - 2\hat k)$
- B$\frac{1}{7}(3\hat i + 6\hat j + 2\hat k)$
- C$\frac{1}{{49}}(3\hat i + 6\hat j - 2\hat k)$
- D$\frac{1}{{49}}(3\hat i - 6\hat j + 2\hat k)$
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