For Companies Like Hewlett-Packard That Sell Their Products Through Various

For companies like Hewlett-Packard that sell their products through various retail operations and not over the Internet, it is important for them to have on their Web site

A) a list of every distributor and retailer that sells HP products
B) a location finder that will refer customers to the closest retail outlet where HP products can be purchased
C) a payment system that customers can use and have the merchandise shipped to their home or place of business
D) all of the above