If $\vec{a} = 2\hat{i} - 3\hat{j} + 4\hat{k}$ and $\vec{b} = \hat{i} + 2\hat{j} - \hat{k}$,then $\vec{a} + \vec{b} = \dots$
- A$3\hat{i} - \hat{j} + 3\hat{k}$
- B$3\hat{i} + \hat{j} + 3\hat{k}$
- C$\hat{i} - \hat{j} - 3\hat{k}$
- D$2\hat{i} + \hat{j} + \hat{k}$
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