Find the Inverse of the Matrix (If It Exists) $$\left[ \begin{array} { l l } 1 & 2 \\3 & 7\end{array} \right]$$

Multiple Choice

Find the inverse of the matrix (if it exists) .
$$\left[ \begin{array} { l l } 1 & 2 \\3 & 7\end{array} \right]$$

A) $\left[ \begin{array} { l l } 7 & 2 \\3 & 1\end{array} \right]$
B) $\left[ \begin{array} { c c } 7 & - 2 \\- 3 & 1\end{array} \right]$
C) $\left[ \begin{array} { l l } - 7 & - 2 \\- 3 & - 1\end{array} \right]$
D) $\left[ \begin{array} { c c } - 7 & - 2 \\3 & 1\end{array} \right]$
E) $\left[ \begin{array} { c c } - 7 & 2 \\3 & - 1\end{array} \right]$