What is the result of performing R2→R2−3R1R_2 \to R_2 - 3R_1R2→R2−3R1 on the matrix (1237)\begin{pmatrix} 1 & 2 \\ 3 & 7 \end{pmatrix}(1327)?
(1201)\begin{pmatrix} 1 & 2 \\ 0 & 1 \end{pmatrix}(1021)
(1203)\begin{pmatrix} 1 & 2 \\ 0 & 3 \end{pmatrix}(1023)
(120−1)\begin{pmatrix} 1 & 2 \\ 0 & -1 \end{pmatrix}(102−1)
(1211)\begin{pmatrix} 1 & 2 \\ 1 & 1 \end{pmatrix}(1121)