An ideal gas is undergoing a cyclic thermodynamic process in different ways as shown in the corresponding P-V diagrams in column 3 of the table. Consider only the path from state 1 to state 2. W denotes the corresponding work done on the system. The equations and plots in the table have standard notations as used in thermodynamic processes. Here  $\gamma$ is the ration of heat capacities at constant pressure and constant volume. The number of moles in the gas is n.
Column 1	Column 2	Column 3
(I) $W_{1\to 2}=\frac{1}{\gamma -1}\left(P_2{V}_2-P_1{V}_1\right)$	(i) Isothermal	(P)
(II) $W_{1\to 2}=-P{V}_2+P{V}_1$	(ii) Isochoric	(Q)
(III) $W_{1\to 2}=0$	(iii) Isobaric	(R)
(IV) $W_{1\to 2}=-nRT\ln \left(\frac{V_2}{V_1}\right)$	(iv) Adiabatic	(S)

Which one of the following options is the correct combination?

• A

  (II) (iv) (P)

• B

  (III) (ii) (S)

• C

  (II) (iv) (R)

• D

  (IV) (ii) (S)