Thermodynamic processes are indicated in the following diagram. Match the following:

Column-$1$	Column-$2$
$P$: Process-$I$	$A$: Adiabatic
$Q$: Process-$II$	$B$: Isobaric
$R$: Process-$III$	$C$: Isochoric
$S$: Process-$IV$	$D$: Isothermal

• A
  $P \to C, Q \to A, R \to D, S \to B$
• B
  $P \to C, Q \to D, R \to B, S \to A$
• C
  $P \to D, Q \to B, R \to A, S \to C$
• D
  $P \to A, Q \to C, R \to D, S \to B$