When customers have their groceries scanned at the supermarket checkout counter, the data are collected

and processed by tracking services such as IRI's InfoScan. Consumer product firms like Procter and

Gamble use data collected by IRI to allocate scarce marketing resources. Which of the following data are

NOT collected at retail checkout counters?

A. coupon redemptions

B. product bar codes

C. product sales

D. free sample redemptions

E. household demographics