The correct option is A Oxygenic with nitrogenase
Plants, algae, and cyanobacteria release oxygen during photosynthesis. Purple bacteria, the green sulfur, and nonsulfur bacteria, the heliobacteria carry out anoxygenic photosynthesis that does not produce oxygen as a byproduct. Heterocysts are specialized nitrogen-fixing cells formed during nitrogen starvation by cyanobacteria and contain the nitrogenase enzyme.