Which of the following materials are used as landfill sealants for the control of gas and leachate movements?

1. Lime

2. Sand

3. Bentonite

4. Fly ash

5. Butyl rubber

Select the correct answer using the codes given below.

Codes:

- 1
  
  1, 2 and 3
- 2
  
  4 and 5
- 3
  
  3 and 5
- 4
  
  1, 2 and 4

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