For what value of $x$, will the two vectors $A =2 \hat{ i }+2 \hat{ j }-x \hat{ k }$ and $B =2 \hat{ i }-\hat{ j }-3 \hat{ k }$ are perpendicular to each other?
- A$x=-2 / 3$
- B$x=3 / 2$
- C$x=-4 / 3$
- D$x=2 / 3$
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- [JEE MAIN 2021]
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- [JEE MAIN 2022]