Managers of a Discount Retailer Would Use Which of the Following

Managers of a discount retailer would use which of the following to access up-to-the-minute sales information obtained from the store's cash registers around the country in order to detect problems with products, promotions, and even the firm's distribution system?

A) a company intranet
B) secondary data
C) a prediction market
D) market intelligence
E) a convenience sample