[Solved] Producing Aircraft

For power-producing aircraft, to maximize both efficiency and performance, you must (best answer)

Group of answer choices

a) Fly at an altitude that is optimized for that aircraft
b) Fly at an angle of attack that is optimized for that aircraft
c) Match the type of engine and the type of propeller where the advantages of each are utilized and nothing is wasted.
d) None of the above.