$P-V$ diagram of an ideal gas is as shown in figure. Work done by the gas in process $ABCD$ is
  • A$4\,{P_0}{V_0}$
  • B$2\,{P_0}{V_0}$
  • C$3\,{P_0}{V_0}$
  • D${P_0}{V_0}$
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