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The Lancefield grouping system:
a. Is used to identify -hemolytic streptococci.
b. Depends on serological detection of polysaccharide and teichoic acid antigens.
c. Depends on serological detection of polysaccharide and teichoic acid antigens and is used to identify -hemolytic streptococci.
D. Is based on a DNA fingerprinting assay specific for streptococci.