The free part of Spotify's freemium business model is largely based on revenues from? A. Selling their own unique products on their site such as "Indy" (independently produced) music B. Selling Advertisements C. Selling Subscriptions D. Selling aggregated anonymous data on their customer's preferences. AirBnB is an example of? A. The sharing economy service model. B. A company designed to never make a profit, but instead be acquired for its large customer base by a large platform company. C. The successful application of ethnographic style research to improve a company's offerings D. A company that never changed its business model