Which of the following matrices are singular (have determinant 0)? (Select all that apply)\n\n(i) $\begin{pmatrix} 3 & 6 \\ 1 & 2 \end{pmatrix}$\n\n(ii) $\begin{pmatrix} 4 & 2 \\ 3 & -1 \end{pmatrix}$\n\n(iii) $\begin{pmatrix} 0 & 7 \\ 0 & 5 \end{pmatrix}$