Let \( A=\left(\begin{array}{ccc}0 & 2 q & r \\ p & q & -r \\ p & -...

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Let \( A=\left(\begin{array}{ccc}0 & 2 q & r \\ p & q & -r \\ p & -q & r\end{array}\right) \). If \( A A^{\top}=I_{3} \), then \( |p| \) is
\( \mathrm{P} \)
(1) \( \frac{1}{\sqrt{5}} \)
(2) \( \frac{1}{\sqrt{3}} \)
(3) \( \frac{1}{\sqrt{6}} \)
(4) \( \frac{1}{\sqrt{2}} \)
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