The state of a certain amount of a gas, not necessarily ideal, is changed from a to b in various hypotheti- cal paths, as shown below. the total amount of the g

The state of a certain amount of a gas, not necessarily ideal, is changed from A to B in various hypotheti- cal paths, as shown below. The total amount of the gas remains constant. Which of the following paths I1. are physicaly realizable ? 3- (IV) P REE ERIDEAVOUR (a)All of them () Only (ii) and (v) (6)Only (). (i) and (ii) (d) Only () and (ii)