Photoautotrophic bacteria use energy from sunlight, carbon dioxide, and water in order to convert into organic materials. They carry out photosynthesis.
Chemoautotrophic bacteria use inorganic molecules such as methane to produce energy. they break the chemical bonds of substances that do not possess carbon to get their energy.
Heterotrophic bacteria rely on autotrophs for food in order to carry out their functions. They do not have the ability to produce their own food.
Answer - Photoautotrophic bacteria - Option 2
Chemoautotrophic bacteria - Option 1
Heterotrophic bacteria - Option 3