In the given statements (a), (b) and (c) are correct. Only (d) is wrong. Since, if electric field lines of force (or electric field) is parallel to Gaussian surface, then angle between normal to surface and electric field is θ = 90°. ∴ By equation of electric flux ϕ = EA cos θ = EA cos 90° = 0 Hence, electric flux will be zero in this situation. Hence, option (c) is the correct.