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Determine whether the matrix is in row echelon form, reduced row echelon form, both, or neither. (a) $\left[\begin{array}{lll}1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 1\end{array}\right]$ (b) $\left[\begin{array}{lll}1 & 0 & 0 \\ 0 & 1 & 0 \\ 0 & 0 & 0\end{array}\right]$ (c) $\left[\begin{array}{lll}0 & 1 & 0 \\ 0 & 0 & 1 \\ 0 & 0 & 0\end{array}\right]$ (d) $\left[\begin{array}{llll}1 & 0 & 3 & 1 \\ 0 & 1 & 2 & 4\end{array}\right]$ (e) $\left[\begin{array}{lllll}1 & 2 & 0 & 3 & 0 \\ 0 & 0 & 1 & 1 & 0 \\ 0 & 0 & 0 & 0 & 1 \\ 0 & 0 & 0 & 0 & 0\end{array}\right]$ (f) $\left[\begin{array}{ll}0 & 0 \\ 0 & 0 \\ 0 & 0\end{array}\right]$ $(g)\left[\begin{array}{rrrr}1 & -7 & 5 & 5 \\ 0 & 1 & 3 & 2\end{array}\right]$
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