Which one of the following aqueous solution when subjected to electrolysis using inert electrodes shows change in concentration without any change in composition.

aq.  K2SO4Discharge potential of H2O  is lesser than  K+2H2O +2e−→ H2+2OH−H2  is liberated at cathode.Discharge potential of H2O is lesser than SO4-22H2O →O2+4H++4e-O2 is liberated at anodeLeft over is concentrated. K2SO4 Conc.↑  composition doesn’t change.