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The adjoint matrix of matrix \( \left[\begin{array}{ll}1 & 2 \\ 3 & 4\end{array}\right] \) is
(A) \( \left[\begin{array}{rr}4 & -2 \\ -3 & 1\end{array}\right] \)
(B) \( \left[\begin{array}{rr}4 & -3 \\ -2 & 1\end{array}\right] \)
(C) \( \left[\begin{array}{ll}4 & 3 \\ 2 & 1\end{array}\right] \)
(D) \( \left[\begin{array}{ll}4 & 2 \\ 3 & 1\end{array}\right] \)
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