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Consider the following regarding the reasons for the fact that now Cyanobacteria are kept in Monera and not in Plantae:

I. They are prokaryotes.

II. The cell wall of cyanobacteria has peptidoglycan.

III. They can fix atomspheric nitrogen

The correct explanations would be:

(1) I and II only

(2) I and III only

(3) II and III only

(4) I, II and III