Every Time Tom Buys a Litre of Milk He Gets

Multiple Choice

Every time Tom buys a litre of milk he gets a stamp,which he sticks on a card he carries in his wallet.When he has 10 stamps,he gets a free litre of milk.This sort of program to encourage repeat business exemplifies which of the following?

A) a developing strategic alliance
B) customer maximization
C) relationship management
D) profit maximization