An online store contacts 1000 customers from its list of customers who have purchased something from them in the last year. In all, 696 of the 1000 say that they are very satisfied with the store's Web site. The population in this setting is
(a) all customers who have purchased something in the last year.
(b) the 1000 customers contacted.
(c) the 696 customers who were very satisfied with the store's Web site.