The Manager of the Customer Service Division of a Major

The manager of the customer service division of a major consumer electronics company is interested in determining whether the customers who have purchased a DVD player made by the company over the past 12 months are satisfied with their products. Which of the following will be a good frame for drawing a sample?

A) telephone directory
B) voting registry
C) the list of customers who returned the registration card
D) a list of potential customers purchased from a database marketing company