How are the keys transformed in the relations to capture a one-to-one relationship in the conceptual model

Which of the following methods could be considered a “best practice” in terms of informing respondents how their answers to an on-line survey about personal information will be protected? the investigator uses the informed consent process to explain how respondent data will be transmitted from the website to his encrypted database without ever recording respondents’ ip addresses, but explains that on the internet confidentiality cannot be absolutely guaranteed. respondents are informed that investigators will try to keep their participation confidential; however, confidentiality cannot be assured. the investigator uses the informed consent process to explain her institution’s method for guaranteeing absolute confidentiality of research data. respondents are informed that a research assistant will transfer all the research data to a password-protected computer that is not connected to the internet, via a usb flashdrive. the computer is located in a research team member’s office.