A cubical region of side a has its centre at the origin. It encloses three fixed point charges, $-q$ at $(0,-a / 4,0),+ 3 q$ at $(0,0,0)$ and $-q$ at $(0,+a / 4,0)$. Choose the correct option(s).
Select ALL correct options:
A
The net electric flux crossing the plane $x=+a / 2$ is equal to the net electric flux crossing the plane $x=-a / 2$.
B
The net electric flux crossing the plane $y=+a / 2$ is more than the net electric flux crossing the plane $\mathrm{y}=-\mathrm{a} / 2$.
C
The net electric flux crossing the entire region is $\frac{q}{\varepsilon_0}$.
D
The net electric flux crossing the plane $z=+a / 2$ is equal to the net electric flux crossing the plane $x=+a / 2$.
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