If the matrix $\begin{bmatrix}a&b\\c&d\end{bmatrix}$ is commutative with the matrix $\begin{bmatrix}1&1\\0&1\end{bmatrix}$ then

Question

$\begin{array}{1 1}(a)\;a=0,b=c&(b)\;b=0,c=d\\(c)\;c=0,d=a&(d)\;d=0,a=b\end{array}$