Which of the following data collection methods is generally the least flexible?

Question

Quizplus · Accepted Answer

Mail questionnaires are generally the least flexible data collection method as they require predetermined questions and fixed response options. Unlike other methods such as online questionnaires or face-to-face interviews, the researcher cannot adjust the questions or follow-up with additional questions in real-time based on the respondent's answers. Mail questionnaires also have lower response rates compared to other data collection methods.

Which of the Following Data Collection Methods Is Generally the Least