Statement I: Carnot engine follows reversible process.

Statement II: Carnot engine works on a cyclic process.

Choose the correct option regarding above statements.

Carnot engine follows cyclic and reversible process.         

          $A\to B$  isothermal process (expansion)

          $B\to C$  adiabatic process (expansion)

          $C\to D$  isothermal process (compression)

          $D\to A$  adiabatic process (compression)

          Process $A\to B\to C\to D\to A$  keeps on repeating in engine $\Rightarrow$  cycle process.

          System starts from A and comes back to A$\Rightarrow$ reversible process.