Find the Inverse of a If It Has One, or State

Multiple Choice

Find the inverse of A if it has one, or state that the inverse does not exist.
- $$A = \left[ \begin{array} { r r r } - 4 & 0 & 0 \\0 & - 1 & 0 \\0 & 0 & 2\end{array} \right]$$

A) Inverse does not exist
B)
$$\left[ \begin{array} { c c c } \frac { 1 } { - 4 } & 0 & 0 \\0 & - 1 & 0 \\0 & 0 & \frac { 1 } { 2 }\end{array} \right]$$
C)
$$\left[ \begin{array} { c c c } 0 & 0 & \frac { 1 } { - 4 } \\0 & - 1 & 0 \\\frac { 1 } { 2 } & 0 & 0\end{array} \right]$$
D)
$$\left[ \begin{array} { r r r } 4 & 0 & 0 \\0 & 1 & 0 \\0 & 0 & - 2\end{array} \right]$$