Solve the System $\left\{ \begin{array} { l } x - y + z = - 3 \\x + y + z = 7 \\x + y - z = - 1\end{array} \right.$

Multiple Choice

Solve the system.
- $\left\{ \begin{array} { l } x - y + z = - 3 \\x + y + z = 7 \\x + y - z = - 1\end{array} \right.$

A) $( - 2,5,4 )$
B) $( 4 , - 2,5 )$
C) $( - 2,4,5 )$
D) $\varnothing$