What is the difference between primary sources and second sources? a: Primary sources relate to publicly available data, like historical documents (e.g., a transcript of oral history, interview data), raw data from an experiment, or demographic records. b: Second sources relate to publicly available data, like historical documents (e.g., a transcript of oral history, interview data), raw data from an experiment, or demographic records. c: Secondary sources have been produced for public consumption in the form of a journal article or a chapter in an edited book. d:Primary sources have been produced for public consumption in the form of a journal article or a chapter in an edited book.
A、ab
B、ac
C、cd
D、bd