Which of the following bacteria is present in the rumen of cattle

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However, certain bacteria, which grow anaerobically on cellulosic material, produce large amounts of methane along with CO2 and H2 . These bacteria are collectively called methanogens, and one such common bacterium is Methanobacterium. These bacteria are commonly found in the anaerobic sludge during sewage treatment. These bacteria are also present in the rumen (a part of stomach) of cattle