Which source should a person use to learn about human immunodeficiency virus (HIV)? a local radio show about HIV health
an online community support group for people who are HIV-positive
a website maintained by the US Department of Health and Human Services
a blog operated by an HIV-positive person

Investigator a has biological specimens that are coded and linked to identifiers of the source individuals. investigator a provides the specimens to investigator b but does not provide the individual identifiers. investigator b agrees not to re-identify the source individuals. is investigator b's research using the biospecimens human subjects research according to the definition of human subjects research in the federal regulations?