Which is true about a doubleslit experiment The diffraction

Which is true about a double-slit experiment?

   The diffraction acts as an envelope that sets the brightness of the double-slit maxima.

   The diffraction acts as an envelope that sets the darkness of the double-slit maxima.

   The double-slit interference acts as an envelope that sets the brightness of the diffraction maxima.

   The double-slit interference acts as an envelope that sets the darkness of the diffraction minima.

and why? please; Thanks!

Solution

The double-slit interference acts as an envelope that sets the darkness of the diffraction minima.