Which of the following on-line research strategies raises the most concerns regarding the ethical principle of respecting the autonomy of research subjects and the corresponding federal regulations requiring informed consent?
1.a linguist copies portions of postings on a political blog to document the use of expletives, abbreviations, and the use of irony in the postings.2.a researcher posts a notice on an open on-line support group for interracial adoptees asking anyone who would be interested in being interviewed for her study to contact her.3.a researcher observes the communications in an open support group without announcing her presence. she is interested in observing how long members participate and how the membership shifts over time.4.a researcher proposes to join a moderated support group for cancer survivors posing as a survivor. she plans to insert comments to see how the members respond.