Which type of coding system is indicated in each of the following independent situations?
a. Airport codes (LAX, OGG)
b. Automatically assigned transaction numbers in a cash register
c. Consecutively numbered purchase orders (101, 102, 103, and so on)
d. Dewey Decimal System (used to classify library books)
e. Invoice numbers
f. National Association of Home Builders chart of accounts (look this one up on the Internet)
g. Standard chart of accounts included with QuickBooks
h. Telephone numbers
i. Universal Product Codes (UPCs)
j. ZIP codes (91768, 63135)