Which of the Following Statements About the Focus-Group Method of Gathering

Which of the following statements about the focus-group method of gathering marketing research is True?

A) Focus groups should not be used in conjunction with any other research technique
B) Focus groups are one of the most commonly used projective techniques for gathering marketing research
C) Focus groups represent a valid sample of the population
D) Focus groups are a new concept and have not yet been used by any major corporations to guide marketing
E) None of the above statements about the focus group method of gathering marketing research is True