Study the given flowchart and identify the processes P, Q, R and S carried out in the given sequence for separation of the mixture.
| P | Q | R | S | |
| A | Sublimation | Magnetic separation | Filtration | Evaporation |
| B | Magnetic separation | Filtration | Sublimation | Evaporation |
| C | Evaporation | Magnetic separation | Filtration | Sublimation |
| D | Sublimation | Magnetic separation | Evaporation | Filtration |