If $A = \begin{bmatrix} 2 & -4 \\ -3 & 6 \end{bmatrix}$,then $A^{-1} =$ . . . . . . .
- A$\frac{1}{24} \begin{bmatrix} 6 & 4 \\ 3 & 2 \end{bmatrix}$
- B$\frac{1}{24} \begin{bmatrix} -2 & 4 \\ 3 & -6 \end{bmatrix}$
- C$\frac{1}{24} \begin{bmatrix} -6 & 4 \\ 3 & -2 \end{bmatrix}$
- Ddoes not exist
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