Find the inverse of A = \\begin{pmatrix} 3 & 0 \\\\ 0 & 1 \\end{pmatrix}.
\begin{pmatrix} -3 & 0 \\ 0 & -1 \end{pmatrix}
\begin{pmatrix} 1/3 & 0 \\ 0 & 1 \end{pmatrix}
\begin{pmatrix} 3 & 0 \\ 0 & 1 \end{pmatrix}
\begin{pmatrix} 0 & 1 \\ 1/3 & 0 \end{pmatrix}