A gaseous system, enclosed in an adiabatic container, is in equilibrium at pressure P, and volume V. Work is done on the system in a quasi-static manner due to which the pressure and volume change to P and V, respectively, in the final equilibrium state. At Cp Cv every instant, the pressure and volume obey the condition PV = C, where y = and C is a constant. If the work done is zero, then identify the correct statement(s) (a) PV = PV (b) PV=yPV (c) PV = (y +1) PV (d) PV = (y-1) PV