The Bio-digester technology can solve the open defecation problem faced by India and contribute to Swachh Bharat Mission. Which among the following is / are features of Bio-digester developed by DRDO?
1. It requires no drainage system or sewage treatment plant
2. It requires periodic charging with anaerobic bacterial inoculums if it is in regular use
3. It produces green energy
Select the correct option from the codes given below:

Answer: [C] Only 1 & 3

This question is a part of GKToday's Integrated IAS General Studies Module