Which one is the correct option for the two different thermodynamic processes?

Option (a) is wrong : In adiabatic process V is not constant. Option (b) is wrong : In isothermal process P is not constant.Option (c) is correct : Isothermal, T=constant Adiabatic, TVγ-1=constant Option (d) is correct : Isothermal, T=constant Adiabatic, P1-γTγ=constant