(Solved): Which of the following matrices are in row-reduced form? (Note: The dotted vertical line in each m ...

Which of the following matrices are in row-reduced form? (Note: The dotted vertical line in each matrix should be a single vertical line.) I. \( \left[\begin{array}{llll}0 & 0 & 1 & 0 \\ 1 & 0 & 1 & 9\end{array}\right] \) II. \( \left[\begin{array}{ll|l}1 & 9 & 8 \\ 0 & 0 & 0\end{array}\right] \) a) None of them b) II and III only c) I and II only d) I and III only e) All of them