Provide the best answer to complete the following statement: Nanook of the North, a documentary film by Robert Flaherty, is used or referred to by anthropologists to demonstrate:

a. How anthropologists and documentary filmmakers worked closely together to demonstrate the primitivity of indigenous peoples.
b. The problematic ways in which such films depicted indigenous communities, and how they have been received and responded to by indigenous communities and other knowledge producers including anthropologists.
c. The multiple ways in which visual productions have been received and responded to by anthropologists.
d. How visual depictions of indigenous communities were accurately presented by early anthropologists and documentary filmmakers.