Which of the following is an orthogonal matrix - \( \mathrm{P} \) (A) \( \left[\begin{array}{ccc...

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Which of the following is an orthogonal matrix -
\( \mathrm{P} \)
(A) \( \left[\begin{array}{ccc}6 / 7 & 2 / 7 & -3 / 7 \\ 2 / 7 & 3 / 7 & 6 / 7 \\ 3 / 7 & -6 / 7 & 2 / 7\end{array}\right] \)
(B) \( \left[\begin{array}{ccc}6 / 7 & 2 / 7 & 3 / 7 \\ 2 / 7 & -3 / 7 & 6 / 7 \\ 3 / 7 & 6 / 7 & -2 / 7\end{array}\right] \)
W
(C) \( \left[\begin{array}{ccc}-6 / 7 & -2 / 7 & -3 / 7 \\ 2 / 7 & 3 / 7 & 6 / 7 \\ -3 / 7 & 6 / 7 & 2 / 7\end{array}\right] \)
(D) \( \left[\begin{array}{ccc}6 / 7 & -2 / 7 & 3 / 7 \\ 2 / 7 & 2 / 7 & -3 / 7 \\ -6 / 7 & 2 / 7 & 3 / 7\end{array}\right] \)
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