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.