All the eigenvalues of the matrix \(\left[ {\begin{array}{*{20}{c}} 1&2&0\\ 2&1&0\\ 0&0&{ - 1} \end{array}} \right]\) are in the disc.

1
|λ + 1| ≤ 1
2
|λ - 1| ≤ 1
3
|λ + 1| ≤ 0
4
|λ - 1| ≤ 2

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