Solve the System $$\left\{ \begin{array} { r r } x - 5 y - z = & 5 \\- 3 x + 15 y + 3 z = & - 15 \\4 x - 20 y - 4 z = & 20\end{array} \right.$$

Multiple Choice

Solve the system.
- $$\left\{ \begin{array} { r r } x - 5 y - z = & 5 \\- 3 x + 15 y + 3 z = & - 15 \\4 x - 20 y - 4 z = & 20\end{array} \right.$$

A) $( - 3,4 , - 28 )$
B) $( 4 , - 3,14 )$
C) $\{ ( x , y , z ) \mid x - 5 y - z = 5 \}$
D) $\varnothing$