Which of the following pairs are correctly matched?

1. Lime soda process...............Softening.

2. Nalgonda technique..............Fluoride removal

3. Aeration..............Coagulation.

4. Ozonation............Disinfection.

Select the correct answer using the codes below:

- 1
  
  1, 2 and 3
- 2
  
  1, 3 and 4
- 3
  
  1, 2 and 4
- 4
  
  2, 3 and 4

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