If $A = \begin{bmatrix} a & c \\ d & b \end{bmatrix}$,then $A^{-1} = $
- A$\frac{1}{ab - cd} \begin{bmatrix} b & -c \\ -d & a \end{bmatrix}$
- B$\frac{1}{ad - bc} \begin{bmatrix} b & -c \\ -d & a \end{bmatrix}$
- C$\frac{1}{ab - cd} \begin{bmatrix} b & d \\ c & a \end{bmatrix}$
- DNone of these
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