In the reported figure, there is a cyclic process ABCDA on a sample of 1 mol of a diatomic gas. The temperature of the gas during the process A → B and C → D are T1 and T2 (T1 > T2) respectively.

Choose the correct option out of the following for work done if processes BC and DA are adiabatic.
(1) WAB = WDC
(2) WAD = WBC
(3) WBC + WDA > 0
(4) WAB < WCD