Two vectors $\vec A\,{\rm{ and }}\vec B$ are such that $\vec A + \vec B = \vec A - \vec B$. Then
- A$\vec A\,.\,\vec B = 0$
- B$\vec A \times \vec B = 0$
- C$\vec A = 0$
- D$\overrightarrow B = 0$
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