Which among the following is not a prokaryote?

Saccharomyces is an ascomycetes fungus and it is unicellular eukaryote involved in fermentation in breweries and the bakery industry. It is a yeast.
(2) Mycobacterium (actinomycete) is a moneran which causes diseases like tuberculosis and leprosy.
(3) Nostoc is an unbranched fi lamentous, heterocystous moneran. It is either free living or symbiont.
(4) Oscillatoria (cyanobacterium) is unbranched, fi lamentous, multicellular, non-heterocystous moneran or
prokaryote.