Find the inverse of the matrix,if it exists: $\left[\begin{array}{ll}2 & 1 \\ 4 & 2\end{array}\right]$
- A$\left[\begin{array}{ll}1 & 0 \\ 0 & 1\end{array}\right]$
- B$\left[\begin{array}{ll}0 & 1 \\ 1 & 0\end{array}\right]$
- CDoes not exist
- D$\left[\begin{array}{ll}2 & 4 \\ 1 & 2\end{array}\right]$
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