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Although the question does not provide options, we can say the following.
Baum and Potter argue that the mass media, as an institution in our democracy, traditionally act as a conduit for information up and down between the political elite and their constituents. This describes the ascendent model of communication, as part of their Theoretical Synthesis between public opinion and Mass Media.
In 2008, these two scholars developed research regarding the way Mass Media and Public opinion related to each other in the United States. Matthew Baum is a professor of Harvard University and Philip B. K. Potter was a professor of Political Science at UCLA.
Their research focused on the way public opinion in America was affected by foreign policy issues and how this public opinion affected the decision made in foreign policy.