If $\overline{a} = 2 \hat{i} + 3 \hat{j} - 4 \hat{k}$ and $\overline{b} = \hat{i} - \hat{j} - \hat{k}$,then the projection of $\overline{b}$ in the direction of $\overline{a}$ is
- A$\frac{1}{\sqrt{29}}$
- B$\frac{2}{\sqrt{3}}$
- C$\frac{5}{\sqrt{3}}$
- D$\frac{3}{\sqrt{29}}$
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