If two vectors $\vec{A} = 4\hat{i} + n\hat{j} + 2\hat{k}$ and $\vec{B} = 2\hat{i} + 2\hat{j} - \hat{k}$ are mutually perpendicular to each other, then the value of '$n$' is:
- A$+3$
- B$+1$
- C$-3$
- D$-1$
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