According to George Miller,the Magic Number for the Capacity of Short

According to George Miller,the magic number for the capacity of short term memory is seven,plus or minus two bits of information.What does more recent research by Cowan (2010) suggest about the capacity of short-term memory

A)  The capacity of short-term memory is higher - up to eleven bits of information. 
B)  The capacity is unlimited. 
C)  The capacity is seven plus or minus two, but only in Caucasian subjects. 
D)  The capacity of short-term memory is only four plus or minus one.