Explanation
Option (1) is correct due to symmetry and option (2) is wrong due to symmetry.
Option (3) is correct because as per Gauss’s theorem, net electric flux passing through any closed surface = qin/ϵ0
qin = 3q – q – q = q
Net elecrtic flux = qin/ϵ0.
Option (4) is wrong , there is no symmetry in two given planes.
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