(Choose 1 answer)
Which sentence is NOT described as "primary resourse"?
A. This kind of research has been collected and published by someone else.
B. Specialize in interviewing, observing, recording, and analyzing the behavior of those who purchase or influence the purchase of a particular good or service
C. Companies and their agencies do their own tracking and monitoring of their customers' behavior
D. Normally it is conducted in large scale
Exit 26
