A Primary Difference Between "Intelligent" Smart Cards and "Memory" Smart

A primary difference between "intelligent" smart cards and "memory" smart cards is that:

A) intelligent smart cards can store information, while memory smart cards cannot.
B) intelligent smart cards are larger than memory smart cards.
C) memory cards can only store information.
D) intelligent smart cards are "digital", while memory smart cards are not.
E) intelligent smart cards are used in ACH transactions, while memory smart cards are not.