What can be concluded if the electric flux through a closed surface is zero?

If the flux through a closed surface is zero, then

The electric flux through the surface

The electric flux through a closed Gaussian surface depends upon

Define electric flux.

A capacitor of capacitance C is charged to a potential V and is placed inside a closed surface. The electric flux through the closed surface is

What is electriG flux ? Explain how the electric flux through a surface is related to electric field intensity, when the surface is heldinside the electric field.