Which surface is considered for Gauss law?

The correct answer is Option (1) → Closed surface enclosing charge

Gauss’s law states that the total electric flux through a closed surface depends on the charge enclosed within it. The surface must be closed to define “inside” and “outside.”

Why not Option (4)?

• Gaussian surface is just a convenient imaginary closed surface chosen for calculation.
• But the law itself is not restricted to only Gaussian surfaces — it applies to any closed surface.