Targeted advertising, in which advertisements are shown to individuals based on past purchases, web searches or other demographic data, has advantages and disadvantages. Which of the following are NOT benefits of targeted advertising? Choose two answers.

A. Individual preferences are able to remain completely private.
B. People are more likely to see advertisements for products they are interested in, and are less likely to see advertisements products which are irrelevant to them.
C. On social media websites people are not exposed to political viewpoints that they do not agree with.
D. Sites can provide content for free to users and use targeted advertising to provide a source of revenue.