In thinking about starting an ad campaign on Facebook, the brand manager considers

Alternative "a" is incorrect because two different users looking at the same Facebook page may see entirely different sets of ads. Alternative "b" is incorrect because brand managers are not buying placement on a specific section or page of the site as they do in traditional media, so they have limited control of where and how the content is displayed. Alternative "c" is incorrect because users do not specify ad positioning and placement. Facebook uses a sophisticated statistical algorithm that ensures that a new series of ads are shown explicitly for the person who is browsing Facebook.