$x=\left[\begin{array}{ll}0 & 1 \\ 1 & 0\end{array}\right] \Rightarrow x^2=$
- A$\left[\begin{array}{ll}0 & 1 \\ 1 & 0\end{array}\right]$
- B$\left[\begin{array}{ll}0 & 1 \\ 0 & 1\end{array}\right]$
- C$\left[\begin{array}{ll}0 & 8 \\ 8 & 0\end{array}\right]$
- ✓$\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]$
Answer: D.
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