If \( A=\left[\begin{array}{lll}1 & 0 & 1 \\ 0 & 0 & 1 \\ a & b & 2...

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If \( A=\left[\begin{array}{lll}1 & 0 & 1 \\ 0 & 0 & 1 \\ a & b & 2\end{array}\right] \), then \( a I+b A+2 A^{2} \) equals
(a) \( A \)
(b) \( -A \)
(c) \( a b A \)
(d) none of these
\( \mathrm{P} \)
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