Find the Inverse of the Matrix $$\left[ \begin{array} { c c } 3 & 6 \\- 9 & - 15\end{array} \right]$$

Multiple Choice

Find the inverse of the matrix $$\left[ \begin{array} { c c } 3 & 6 \\- 9 & - 15\end{array} \right]$$ .

A) ​ $$\frac { 1 } { 7 } \left[ \begin{array} { c c } 3 & 6 \\- 9 & - 15\end{array} \right]$$
B) ​ $$\frac { 1 } { 3 } \left[ \begin{array} { c c } - 5 & - 2 \\3 & 1\end{array} \right]$$
C) ​ $$\left[ \begin{array} { c c } - 3 & - 6 \\15 & 9\end{array} \right]$$
D) ​ $$\left[ \begin{array} { c c } 3 & - 9 \\12 & - 21\end{array} \right]$$
E) ​ $$\frac { 1 } { 13 } \left[ \begin{array} { l l } - 3 & - 6 \\- 9 & 15\end{array} \right]$$