Consider the following statement regarding the compositing method,

1. Indore process of compositing is aerobic and takes 3 – 4 months to decompose the waste.

2. Bangalore’s process of compositing is anaerobic and takes 2 – 3 months to decompose the waste.

3. An initial C/N ratio of 30 to 50 is optimal for compositing.

4. Lower C/N ratio leads to loss of nitrogen and slows down the rate of decomposition.

5. Higher C/N ratio leads to slowing down the rate of decomposition and digestion of organic matter incomplete.  

Which of the above are correct?