What Was Achieved by Baddeley's Concept of Working Memory

Multiple Choice

What was achieved by Baddeley's concept of working memory

A)  It recognizes the complexity of short-term memory. 
B)  It expands the functions and processes of long-term memory. 
C)  It integrates sensory memory, short-term memory, and long-term memory into a single, complex system. 
D)  It takes the place of the old concept of sensory memory.