According to the Chapter on Working Memory, What Was Nontraditional

According to the chapter on working memory, what was nontraditional about George Miller's article on the "magical number seven"?

A) Research in a wide variety of cross-cultural settings continues to confirm that working memory is limited to seven items.
B) Researchers had previously thought that the capacity of visual memory had no strict limits.
C) Miller's research helped to persuade psychologists that the Atkinson-Shiffrin model of memory was inadequate.
D) Miller's article emphasized active mental processes, rather than simply focusing on the stimulus and the response.