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What is the difference between the natural rate of unemployment vs. the full employment rate of unemployment? O a) The natural rate of unemployment is the economy's long-run unemployment rate in the absence of government intervention while the full employment rate of unemployment is a policy preference initiated by Congress. b) The natural rate of unemployment ranges between 5-6% unemployment while the full employment rate of unemployment is lower, at about 4%. Oc) Both the natural rate of unemployment and the full employment rate of unemployment consist of the same 2 types of unemployment. O d) All of the above are true