If \( A=\left[\begin{array}{cc}a b & b^{2} \\ -a^{2} & -a b\end{array}\right] \), then \( A \) i...

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If \( A=\left[\begin{array}{cc}a b & b^{2} \\ -a^{2} & -a b\end{array}\right] \), then \( A \) is
\( \mathrm{P} \)
(A) Involutory matrix
(B) Idempotent matrix
(C) Nilpotent matrix
(D) none of these
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