Which career or situation do you think would be the most challenging to take on a leadership role in? CEO of a tech company, Elementary school teacher, Manager at a restaurant, Captain of the pep squad

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?