Use the Gauss-Jordan Method to Solve the System of Equations $x+y+z=9$

Multiple Choice

Use the Gauss-Jordan method to solve the system of equations.
- $x+y+z=9$
$2 x-3 y+4 z=7$
$x-4 y+3 z=-2$

A) $\left(\frac{7 z+34}{5}, \frac{2 z-11}{5}, z\right)$
B) $\left(\frac{-7 z+34}{5}, \frac{2 z+11}{5}, z\right)$
C) $\left(\frac{-7 z+34}{5}, \frac{2 z-11}{5}, z\right)$
D) $\left(\frac{7 z+34}{5}, \frac{2 z+11}{5}, z\right)$