In Kingdon's model of agenda setting in public policymaking, which is NOT one of the three streams of activity?

Kingdon's model of agenda setting in public policy making are made up of three streams which are; the problem stream, policy stream and political stream. The problem stream has to do with the perception of problems as a public issue that requires government attention and the policy stream has to do with analysing these problems and coming up with policies to address them. The political stream has to do with the political mood and atmosphere of the people.