$$A = \begin{bmatrix}4 & 0 & 0 \\0 & 5 & 0 \\0 & 0 & 6 \end{bmatrix} \Rightarrow A^{-1} =$$

A

$$\begin{bmatrix}-\frac{1}{4} & 0 & 0 \\0 & -\frac{1}{5} & 0 \\0 & 0 & -\frac{1}{6} \end{bmatrix}$$

B

$$\begin{bmatrix}0 & 0 & \frac{1}{4} \\0 & \frac{1}{5} & 0 \\\frac{1}{6} & 0 & 0 \end{bmatrix}$$

C

$$\begin{bmatrix}\frac{1}{4} & 0 & 0 \\0 & \frac{1}{5} & 0 \\0 & 0 & \frac{1}{6} \end{bmatrix}$$

D

$$\begin{bmatrix}-\frac{1}{4} & 0 & 0 \\0 & \frac{1}{5} & 0 \\0 & 0 & -\frac{1}{6} \end{bmatrix}$$