All of the following types of unemployment always exist except Select one: O a. Frictional unemployment O b. The natural rate of unemployment crum out O c. cyclical unemployment O d. Structural unemployment cross cut O e. None of the above cross out Which of the following groups of people would be included in the official unemployment rate? Select one: O a, discouraged workers cross out O b. underemployed workers croat out O c. part-time workers cross out O d. a full-time university student cross out O e. workers working in the underground economy cross out