A recurrence relation is defined by $a_n = 4a_{n-1} - 3a_{n-2}$. Which of the following is an equivalent representation using a matrix shift operator $M$ such that $\begin{pmatrix} a_n \\ a_{n-1} \end{pmatrix} = M \begin{pmatrix} a_{n-1} \\ a_{n-2} \end{pmatrix}$?