In the following figure, four curves $A, B, C$ and $D$ are shown. The curves are
  • AIsothermal for $A$ and $D$ while adiabatic for $B$ and $C$
  • BAdiabatic for $A$ and $C$ while isothermal for $B$ and $D$
  • CIsothermal for $A$ and $B$ while adiabatic for $C$ and $D$
  • DIsothermal for $A$ and $C$ while adiabatic for $B$ and $D$
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