25. Which of the following is the set of the eigenvalues of $\mathbf{A} = \begin{bmatrix} 0 & -1 & -1 \\ 0 & 1 & 1 \\ 2 & 2 & -1 \end{bmatrix}$?
(A) $\{-1, 0, 1\}$;
(B) $\{-1, -1, 0\}$;
(C) $\{0, 1, 1\}$;
(D) $\{-1, 1, 1\}$;
(E) $\{-1, -1, 1\}$; (f) $\{1, 1, 1\}$.

3. Proof Questions (15%)

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