Perform the Indicated Row Operations on the Matrix $$\left[ \begin{array} { c c c } 1 & 7 & 1 \\- 7 & - 48 & - 8 \\- 5 & - 1 & - 39\end{array} \right]$$

Multiple Choice

Perform the indicated row operations on the matrix. Show the final result.
$$\left[ \begin{array} { c c c } 1 & 7 & 1 \\- 7 & - 48 & - 8 \\- 5 & - 1 & - 39\end{array} \right]$$
Add 7 times $R _ { 1 }$ to $R _ { 2 }$ .
Add 5 times $R _ { 1 }$ to $R _ { 3 }$ .

A) $\left[ \begin{array} { c c c } - 5 & 4 & 1 \\ - 7 & - 48 & - 8 \\ - 5 & - 1 & - 39 \end{array} \right]$
B) $\left[ \begin{array} { c c c } 1 & 7 & 1 \\ 0 & 1 & - 7 \\ 0 & 6 & - 38 \end{array} \right]$
C) $\left[ \begin{array} { c c c } 1 & 7 & 1 \\ 0 & 1 & - 1 \\ 0 & 34 & - 34 \end{array} \right]$
D) $\left[ \begin{array} { c c c } 1 & 7 & 1 \\ - 48 & - 329 & - 55 \\ - 24 & 2 & - 194 \end{array} \right]$
E) $\left[ \begin{array} { c c c } 1 & 7 & 1 \\ 0 & - 13 & - 3 \\ 0 & 48 & 10 \end{array} \right]$