Researchers endeavoring to conduct an on-line study should consider that there are some potential risks of harm to subjects unique to internet-based research. One of these risks is:1. Recruiting, consenting and debriefing subjects takes place on-line, and may require little to no interaction with the subjects.2. People assume pseudonymous on-line identities, such as an avatar in an MMORPG.3. Online studies do not require the documentation of informed consent.4. Individuals may post private identifiable information about themselves on-line without intending it to be public and available to researchers.5. Individuals may post private identifiable information about themselves on-line without intending it to be public and available to researchers.

Answer is 5. Individuals may post private identifiable information about themselves on-line without intending it to be public and available to researchers.

Explanation:

It should be noted that as the internet have many advantages, so also it has disadvantages.

There are so many people known as hackers , who know how to find their ways in accessing information that are not meant for them. This they do in a crooked way.

In this sense, people should avoid posting information that are sensitive online, especially when they are undergoing online lectures or internet based research.

They should adopt other means, if it is compulsory or necessary to pass sensitive information to their online tutor.

Finally, people should understand that anything posted online directly or indirectly is public, that is , seen by many people.