Observers of the Supermarket Industry See No Letup in the Use

Observers of the supermarket industry see no letup in the use of checkout-counter-based target marketing.Sav-More supermarkets have installed an electronic marketing system in their stores.The system allows the stores to do more direct mail promotions by combining the current Sav-More's cheque-cashing cards with the new Sav-More's Bonus Club frequent-shopper cards.The new system uses bar-code scanners and magnetic cards issued to shoppers to track all purchases.As with most customer databases,demographic information is gathered for subsequent offers to frequent-shopper club members,and psychographic information is tracked whenever customers use the magnetic strip cards to make purchases.Generally,marketing to these consumers achieves better results than free-standing insert (FSI) coupons and flyers.
-Refer to Sav-More Supermarkets.Al Edisto,Sav-More's frozen-food manager,decided to survey each customer who stops in front of the frozen orange juice section on Saturday.What is this type of sample called?

A) simple random
B) piggyback
C) probability
D) convenience