QUESTION 15 In the aftermath of the U.S. recession that ran from Dec. 2907 through June 2009, many economists were concerned that the full employment unemployment rate would rise as the long time unemployed suffered deterioration of their skin. Expressed in terms of the types of unemployment, their concern was that @ a cyclical unemployment would turn into structural unemployment for some workers b. structural unemployment would turn into cyclical unemployment for some workers. e cyclical unemployment would become permanently greater than zero. @d frictional unemployment would turn into structural unemployment for some workor