\( \vec{r} \cdot \vec{a}=\vec{r} \cdot \vec{b}=\vec{r} \cdot \vec{c}=0 \) where \( \vec{a}, \vec...

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\( \vec{r} \cdot \vec{a}=\vec{r} \cdot \vec{b}=\vec{r} \cdot \vec{c}=0 \) where \( \vec{a}, \vec{b}, \vec{c} \) arenon-coplanar,
(A) \( \vec{r} \perp \vec{c} \times \vec{a} \)
(B) \( \vec{r} \perp \vec{a} \times \vec{b} \)
(C) \( \vec{r} \perp \vec{b} \times \vec{c} \)
(D) \( \vec{r}=\overrightarrow{0} \)
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