Question id 163 - Aircraft General Knowledge - Airframe, Systems, Powerplant - ATPL - Airline Transport Pilot license

Passed Across An Expansion Turbine, Then Compressed And Passed Through A Heat Exchanger.
Compressed, then goes through a heat exchanger, and across an expansion turbine.
Compressed, then passed across an expansion turbine and finally across a heat exchanger.
Passed Across An Expansion Turbine, Then Directly To The Heat Exchanger.