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Option D
A reheating
B intercooling
C regenerator
D all of the above
Thank you for invitation ...
the Q is out of my major..
I believe the answer is choice "D"
Choice "D" all of the above.
I would have to guess ... since this is not a part of my studies , however I have been reading on http://en.wikipedia.org/wiki/Thermal_efficiency about this subject I chose D