What type of survey should be used when it is most important that respondents answer frankly and honestly?

Name: What type of survey should be used when it is most important that respondents answer frankly and honestly?
Brand: Quizplus
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Question

Quizplus · Accepted Answer

Mail surveys tend to encourage more honest responses because respondents can complete them in private, without the presence of an interviewer, which might influence their answers due to social desirability bias or interviewer bias.

What Type of Survey Should Be Used When It Is