Which of the Following Is True of Syndicated Studies

Which of the following is true of syndicated studies?

A) They are obtained only by watching how people behave, either in person or by using a machine to record events.
B) They can be standardized in the form of a questionnaire alone and asked to a large representative sample to obtain accurate data.
C) They refer to studies that always have a large sample of respondents that voluntarily completes questionnaires on a regular basis so that researchers can assess changes in behaviour and attitudes.
D) They are a hybrid of primary and secondary research conducted by a research company, spreading the cost across many clients to reduce the price.