Ans.
Cyanobacteria are autotrophic bacteria that can synthesize their own food with the help of photosynthesis. They are prokaryotic organisms that lack membrane bound organelles, such as chloroplasts and mitochondria.
They contain various pigments, such as chlorophyll (green pigments), carotenoids (yellow or orange pigment), and phycobilin (blue pigment).
Thus, the correct answer is option). 'carotenoid pigments.'