Which of these are characteristics of an abuser in an abusive relationship? select the three correct answers.
a. overly critical
b. playing the victim
c. controlling
d. supportive

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?