To Avoid Obtaining Inaccurate Information from Online Survey Participants, Marketers

To avoid obtaining inaccurate information from online survey participants, marketers learn about customers by observing their behavior using each of the following except

A) transaction logs that record user activities at a company's Web site.
B) cookies that allow a Web site to store data on the user's PC.
C) spyware that gathers user information through an Internet connection without the user's knowledge.
D) data mining to analyze clickstream data.