The matrix \( \left[\begin{array}{ccc}-1 & 0 & 0 \\ 0 & -1 & 0 \\ 0...

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The matrix \( \left[\begin{array}{ccc}-1 & 0 & 0 \\ 0 & -1 & 0 \\ 0 & 0 & -1\end{array}\right] \) is:
\( \mathrm{P} \)
W
(1) Column matrix
(2) Null matrix
(3) Scalar matrix
(4) Identity matrix
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