The chained consumer price index (CPI) is a/an:

a. geometric average of the prices of all goods produced in GDP.

b. arithmetic average of the prices of all goods produced in gross domestic product (GDP).

c. arithmetic average of the prices of all consumer goods produced in GDP.

d. process of linking the prices of older goods that are no longer produced (such as cassette tapes and eight-track tapes) with "modern" goods (such as MP3 and MP4 players) in a process called chaining.

e. geometric average of the prices of the typical consumer market basket.