Baddeley's Model of Working Memory Had a Different Focus from the Earlier

Baddeley's model of working memory had a different focus from the earlier approaches to short-term memory because

A) he emphasized that working memory is useful in holding related items in our memory simultaneously.
B) he devised a precise operational definition for every component of working memory.
C) he examined a much more limited set of processes, compared to earlier models.
D) he focused much more on the visual characteristics of stimuli than on the auditory characteristics of the stimuli.