A study examined how the behavior of cashiers and clerks varied depending on the race/ethnicity of the customers. The researchers found that when purchasing with a credit card or personal check, African American and Latino shoppers were more likely than White shoppers to be asked to show formal identification. The behavior observed in the cashiers and clerks exemplify which of the following concepts:

(A) Stereotype
(B) Prejudice
(C) Discrimination
(D) Out-group membership