Correct option (a) Archaebacteria
Explanation:
Archaebacteria can flourish in hot springs and deep sea hydrothermal vents. Eubacteria a.re time bacteria, characterised by the presence of rigid cell wall and erectile a flagellum. Most fungi are heterotrophic and absorb soluble organic matter from dead substrates and hence, are called saprophyte. The cyanobacteria have chlorophyll-a similar to green plants and are photosynthetic autotrophs.