To make on-campus financial transactions easier, a university issues cards with embedded microchips to students. The cards are loaded with an amount of money and they can then be used to make purchases a variety of places on campus, such as the bookstore, the cafeteria, parking meters, and even vending machines. This is an example of a(n) _______.
A. Electronic funds transfer (EFT)
B. Debit card
C. Automated clearing house (ACH) network
D. Smart card
E. Letter of credit