Row echelon forms of the augmented matrices for three systems of linear equations in \(x\), \(y\) and \(z\) are given below. For each augmented matrix, \(A\), \(B\) and \(C\), which of the following options correctly describes the number of solutions to the corresponding system of linear equations? \[ \underbrace { \begin{bmatrix} 1 & 0 & 0 & \bigm | & -2 \\ 0 & 1 & 0 & \bigm | & 1 \\ 0 & 0 & 0 & \bigm | & -2 \end{bmatrix} }_{A} \qquad \underbrace { \begin{bmatrix} 1 & 0 & 0 & \bigm | & 0 \\ 0 & 1 & 0 & \bigm | & 2 \\ 0 & 0 & 1 & \bigm | & -1 \end{bmatrix} }_{B} \qquad \underbrace { \begin{bmatrix} 1 & 0 & 0 & \bigm | & 1 \\ 0 & 1 & 0 & \bigm | & -3 \\ 0 & 0 & 0 & \bigm | & 0 \end{bmatrix} }_{C} \]