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

Multiple Choice

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

A) $\{ ( 3 , - 1,1 ) \}$
B) $\varnothing$
C) $\{ ( - 1,1,3 ) \}$
D) $\{ ( - 1,3,1 ) \}$