Consider the Matrix $\left[ \begin{array} { c c : c } 1 & - 4 & 8 \\2 & 8 & 8\end{array} \right]$

Multiple Choice

Consider the matrix $\left[ \begin{array} { c c : c } 1 & - 4 & 8 \\2 & 8 & 8\end{array} \right]$ . What elementary row operation was performed to obtain the matrix $\left[ \begin{array} { c c : c } 1 & - 4 & 8 \\0 & 16 & - 8\end{array} \right]$ ?

A) $- 2 R _ { 1 } + R _ { 2 }$
B) $2 R _ { 1 } + R _ { 2 }$
C) $- 2 R _ { 2 } + R _ { 1 }$
D) $2 R _ { 2 } + R _ { 1 }$