Consider the following materials :
1. Agricultural residues
2. Corn grain
3. Wastewater treatment sludge
4. Wood mill waste
Which of the above can be used as feedstock for producing Sustainable Aviation Fuel?
1
1 and 2 only
2
3 and 4 only
3
1, 2, 3 and 4
4
1, 3 and 4 only