Select the correct sequence of the treatments or methods which are generally given to treat raw water supplies.

1
Screening, sedimentation, coagulation, filtration, disinfection
2
Screening, sedimentation, disinfection, aeration, coagulation
3
Filtration, sedimentation, coagulation, disinfection
4
Sedimentation, screening, disinfection, filtration, coagulation

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