With Respect to Web-Based Business Models,advertising Models Involve

With respect to web-based business models,advertising models involve:

A) bringing buyers and sellers together for online business transactions and taking a percentage from the sales.
B) providing a meeting point sold by subscription or supported by advertising.
C) offering a free service and encouraging users to buy extras.
D) providing free information or services and then generating revenues from paid commercials made available to viewers.
E) providing free service in exchange for collecting information on users and selling it to other businesses.