Two vectors $\vec{A}$ and $\vec{B}$ are at right angles to each other,when
- A$\vec{A} + \vec{B} = 0$
- B$\vec{A} - \vec{B} = 0$
- C$\vec{A} \times \vec{B} = 0$
- D$\vec{A} \cdot \vec{B} = 0$
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