Which of the Following Is a Characteristic of Purchase Panels

Which of the following is a characteristic of purchase panels (Table 4.3 in the text) ?

A) data banks on industrial establishment created through direct inquiries of companies,clipping services,and corporate reports
B) household purchases recorded through electronic scanners in supermarkets
C) verification of product movement by examining physical records or performing inventory analysis
D) households provide specific information regularly over an extended period of time;respondents asked to record specific behaviors as they occur