The figure shows the P-V plot an ideal gas taken through a cycle ABCDA. The part ABC is a semi-circle and CDA is half of an ellipse. Then,
(A) The process during the path A→ B is isothermal
(B) Heat flows out of the gas during the path B →C → D
(C) Work done during the path A→B→ C is zero
(D) Positive work is done by the gas in the cycle ABCDA
