(Choose 1 answer)
Which sentence(s) is/are TRUE about "Secondary research"?
A. Background research that uses available published information about a topic
B. When advertising people get new accounts or new assignments, they start by reading everything they can find on the product, company, industry, and competition: sales reports, annual reports, complaint letters, and trade articles about the industry. They are looking for important facts and key insights.
C. This kind of research has been collected and published by someone else.
D. All of others are correct
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