Maria, a restaurant manager, discovers contaminated lettuce containers in the cooler. How best should she proceed? A by instructing food handlers to use the lettuce with caution
B. by not allowing food handlers to use the cooler again
C. by discarding the lettuce so food handlers do not use it
D. by asking food handlers to wash and sanitize the lettuce properly

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?