Microbial fuel cells are considered a source of sustainable energy. Why?1. They use living organisms as catalysts to generate electricity from certain substrates.2. They use a variety of inorganic materials as substrates.3. They can be installed in waste water,treatment plants to cleanse water and produce electricity.Which of the statements given above is/are correct ?

Microbial fuel cells are considered a source of sustainable energy. Wh

1.	Microbial fuel cells are considered a source of sustainable energy. Why?1. They use living organisms as catalysts to generate electricity from certain substrates.2. They use a variety of inorganic materials as substrates.3. They can be installed in waste water,treatment plants to cleanse water and produce electricity.Which of the statements given above is/are correct ?
A.	1 only
B.	2 and 3 only
C.	1 and 3 only
D.	1,2 and 3
Answer» E.