Arrange the following drinking water treatment components in a sequential order.

1. Sedimentation

2. Aeration

3. Filtration

4. Disinfection

1
1 -> 2 -> 3 -> 4
2
2 -> 1 -> 3 -> 4
3
1 -> 4 -> 2 -> 3
4
1 -> 3 -> 2 -> 4

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