Viruses are grouped on the basis of size and shape, chemical composition and structure of the genome, and mode of replication.
Viruses consists of a single-or-double-stranded nucleic acid (DNA or RNA) surrounded by a protein shell. The entire genome may take up either one nucleic acid molecule or several nucleic acid segments. The various types of genome require different replication procedures. They also vary in shape.
Answer: Options A, C, and D
