If a ground water containing irons treated manganese, calcium and magnesium is treated in its sequential order in a nearby water treatment plant before distributing it into the distribution mains, Identify the correct order of the treatment suitable for the given sample of water.
1
Sedimentation → Aeration→ Filtration →Disinfection → Softening
2
Aeration → Coagulation & Flocculation → Sedimentation → Softening → Filtration
3
Aeration → Sedimentation → Softening → Desalination → Screening
4
Sedimentation → Softening → Desalination → Aeration → Disinfection