Traditional Ethnographic Research Focused on the Single Community or Culture

Traditional ethnographic research focused on the single community or culture, which was treated as more or less isolated and unique in time and space. However,

A) all such single communities have already been studied, so anthropologists have very limited project choices.
B) there has been a shift within the discipline toward a recognition of ongoing and inescapable flows of people, technology, images, and information.
C) the American Anthropological Association still requires its members to strive toward research focused on one single community.
D) this is no longer true, nor has it ever been true, a fact that renders classic ethnographies historical curiosities and not serious academic works.
E) there has been a shift within the discipline against the concept of culture and toward the individual as the only true, reliable unit of analysis.