If the lines given by $\bar{r} = 2 \hat{i} + \lambda(\hat{i} + 2 \hat{j} + m \hat{k})$ and $\bar{r} = \hat{i} + \mu(2 \hat{i} + \hat{j} + 6 \hat{k})$ are perpendicular,then the value of $m$ is:
- A$\frac{3}{2}$
- B$\frac{-3}{2}$
- C$\frac{2}{3}$
- D$\frac{-2}{3}$
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