Which of the following is not of ethical concern regarding survey research on the Internet?单项选择题

题目图片
A

A. respondents are increasingly upset at getting unsolicited e-mail for online surveys

B

B. some researchers harvest e-mail addresses from forums without permission

C

C. opt-in communities usually cost the client firms more than traditional methods

D

D. user data is relatively easy and profitable to sell, although many users prefer that it be kept private

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