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    Option c is correct. Coronaviruses are a large family of viruses and belong to the Nidovirus family or Nidovirales order, which includes Coronaviridae, Arteriviridae, and Roniviridae families.
        
    
    
        
    Option c is correct. Coronaviruses are a large family of viruses and belong to the Nidovirus family or Nidovirales order, which includes Coronaviridae, Arteriviridae, and Roniviridae families.