A Generic Norm, According to Tajfel (1970)

A generic norm, according to Tajfel (1970) :

A) manifests itself in discriminatory behaviour only when hostility or prejudice has formed
B) is effective only among low status members of a group
C) leads to discrimination against an out-group only when it contributes to an individual's self-interest
D) tends, once it develops, to be manifest regardless of the context of the interaction
E) both a and c