If the system of equations
$$\begin{aligned}
& 2 x + y - z = 5 \\
& 2 x - 5 y + \lambda z = \mu \\
& x + 2 y - 5 z = 7
\end{aligned}$$
has infinitely many solutions, then $( \lambda + \mu ) ^ { 2 } + ( \lambda - \mu ) ^ { 2 }$ is equal to\\
(1) 904\\
(2) 916\\
(3) 912\\
(4) 920