Perform the Row Operation(s) on the Given Augmented Matrix A) $\left[ \begin{array} { r r | r } 1 & - 1 & - 2 \\ 2 & 1 & - \frac { 5 } { 2 } \end{array} \right]$

Multiple Choice

Perform the row operation(s) on the given augmented matrix.
- $$\begin{array} { l } \mathrm { R } _ { 1 } = \frac { 1 } { 2 } \mathrm { r } _ { 1 } \\{ \left[ \begin{array} { r r | r } 2 & - 2 & - 4 \\4 & 2 & - 5\end{array} \right] }\end{array}$$

A) $\left[ \begin{array} { r r | r } 1 & - 1 & - 2 \\ 2 & 1 & - \frac { 5 } { 2 } \end{array} \right]$

B) $\left[ \begin{array} { r r | r } 1 & - 1 & - 4 \\ 4 & 2 & - 5 \end{array} \right]$

C) $\left[ \begin{array} { r r | r } 1 & - 1 & - 2 \\ 5 & 1 & - 7 \end{array} \right]$

D) $\left[ \begin{array} { r r | r } 1 & - 1 & - 2 \\ 4 & 2 & - 5 \end{array} \right]$