The above T-S diagram for a gas turbine plant is drawn for the case where :
(a) Compression of air is done in two stages incorporating an intercooler between two.
(b) Expansion of gases is done in two stages followed by regeneration.
(c) Expansion of gases is done in two stages with a reheater between the two.
(d) Expansion of gases is done in two stages with a reheater between the two followed by regeneration.