With reference to the Sanitary Landfills, consider the following statements:
1. Methane produced from the decomposition of trash in landfills is collected to generate electricity.
2. High-density plastics are used on top of first layer clay for reinforcement.
3. Topping of landfills is done with synthetic plastic to prevent methane from escaping.
Which of the statements given above is/are correct?
1
1 and 3 only
2
2 and 3 only
3
1 and 2 only
4
1, 2 and 3