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.