Determine if the matrix

$$\left[\begin{array}{rrrrr} 1 & -6 & 0 & 1 & 0 \\ 0 & 0 & 1 & -6 & 0 \\ 0 & 0 & 0 & 0 & 1\end{array}\right]$$

is in echelon form, reduced row echelon form, or neither. Choose the most appropriate answer.

Answer: select echelon form reduced row echelon form not in echelon form .