What is the difference between confidential and anonymous data in marketing research?

Question $4$Answer

a$.$

Confidential data means respondents do not share any identifying information, while anonymous data means respondents share identifying information only with the researcher.

b$.$

Confidential data is used for internal purposes only, while anonymous data is published.

c$.$

Confidential data is shared publicly, while anonymous data is kept private.

d$.$

Confidential data means respondents share identifying information only with the researcher, who keeps it private, while anonymous data means respondents do not provide identifying information at all.

e$.$

Confidential data is collected through online surveys, while anonymous data is collected through in$-$person interviews.