An ideal air compressor cycle without clearance on p-v diagram can be represented by following processes________________?

A. one adiabatic, two isobaric, and one constant volume
B. two adiabatic and two isobaric
C. two adiabatic, one isobaric and one constant volume
D. one adiabatic, one isobaric and two constant volume
E. two isobaric, two adiabatic and one constant volume