Solve the System of Linear Equations $$\left\{ \begin{array} { l } x + y + z = 0 \\3 x + 5 y + 4 z = 9 \\3 x + 6 y + 5 z = 6\end{array} \right.$$

Multiple Choice

Solve the system of linear equations.​ $$\left\{ \begin{array} { l } x + y + z = 0 \\3 x + 5 y + 4 z = 9 \\3 x + 6 y + 5 z = 6\end{array} \right.$$ ​

A) ​ $( 3,12 , - 15 )$
B) ​ $( 3,12,15 )$
C) ​ $( - 3 , - 12 , - 15 )$
D) ​ $( 3 , - 12 , - 15 )$
E) ​ $( - 3,12 , - 15 )$