Let \( E=\left[\begin{array}{lll}0 & 1 & 0 \\ 0 & 0 & 1 \\ 0 & 0 & ...
Let \( E=\left[\begin{array}{lll}0 & 1 & 0 \\ 0 & 0 & 1 \\ 0 & 0 & 0\end{array}\right], F=\left[\begin{array}{lll}0 & 0 & 0 \\ 1 & 0 & 0 \\ 0 & 1 & 0\end{array}\right] \) and \( x \in \mathbf{R} \), then \( \left(E+x F^{2}\right)^{3} \) equals
(a) \( x I \)
(b) \( O \)
(c) \( x E \)
(d) \( x F \)
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