Fill in the Blank(s)using Elementary Row Operations to Form a Row-Equivalent

Fill in the blank(s) using elementary row operations to form a row-equivalent matrix.​ $$\left[ \begin{array} { c c c } 1 & 1 & 1 \\5 & - 2 & 4\end{array} \right]$$ $$\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & \cdots & - 1\end{array} \right]$$

A) ​ $$\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & 3 & - 1\end{array} \right]$$
B) ​ $$\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & 0 & - 1\end{array} \right]$$
C) ​ $$\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & - 9 & - 1\end{array} \right]$$
D) $$\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & - 7 & - 1\end{array} \right]$$
E) ​ $$\left[ \begin{array} { c c c } 1 & 1 & 1 \\0 & 7 & - 1\end{array} \right]$$

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