For what value of $x$ will the two vectors $\vec{A} = 2\hat{i} + 2\hat{j} - x\hat{k}$ and $\vec{B} = 2\hat{i} - \hat{j} - 3\hat{k}$ be perpendicular to each other?
- A$x = 2/3$
- B$x = 3/2$
- C$x = -4/3$
- D$x = -2/3$
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