Facebook Was a "Closed" System of Private and Personal Profiles,how

Multiple Choice

Facebook was a "closed" system of private and personal profiles,how could brand managers use Facebook in their advertising strategy?

A) Facebook allowed companies' ads to show up in pop-up windows throughout the site.
B) Facebook charged companies to create a Facebook Page for their brands.
C) Facebook staff developed ads for companies who wanted to advertise on Facebook.
D) Facebook charged companies when their brand was mentioned in a user's profile.
E) Facebook allowed brand managers to promote their business on Facebook separate from their private and personal profiles.