If $\bar{a}=3 \hat{i}+\hat{j}-\hat{k}, \bar{b}=2 \hat{i}-\hat{j}+23 \hat{k}$ and $\bar{c}=7 \hat{i}-\hat{j}+23 \hat{k}$,then which of the following is valid?
- A$\overline{a}, \overline{b}, \overline{c}$ are mutually perpendicular
- B$\overline{a}, \overline{b}, \overline{c}$ are non-coplanar
- C$\overline{a}$ and $\overline{b}$ are collinear
- D$\overline{a}, \overline{b}, \overline{c}$ are coplanar
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