A questionnaire has an ID number in one corner that allows the research team to identify the subject. This is an example of:

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Confidentiality is the safe management of private information shared by a subject. The researcher must refrain from sharing that information without the authorization of the subject. Research findings need to be reported so that a subject or group of subjects cannot be identified.
Complete anonymity exists if the subject's identity cannot be linked, even by the researcher, with his or her individual responses.
Deception is deliberately not disclosing all aspects of the study to the subjects.
Informed consent means that the subject has been told about all aspects of the study including the risk/benefit ratio and agrees to participate.

A Questionnaire Has an ID Number in One Corner That