Zan wants to collect considerable information about the current opinions of his 10 most important customers. Zan will probably use the __________ research method.

Zan wants to collect considerable information about the current opinions of his 10 most important customers. Zan will probably use the __________ research method. 



A. social media monitoring

B. experimental

C. in-depth interview

D. primary data mining

E. observation


Answer: C. in-depth interview


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