D is corrent. Changes over time in the structure of consumer demand, which in turn alters the structure or composition of the demand for labor, is what is referred to as structural unemployment.
A is incorrect. Frictional unemployment is due to imperfections in the labor market and relates to workers searching for jobs or waiting to take jobs in the near future.
B is incorrect. Cyclical unemployment is caused by the recession phase of the business cycle, that is, by a deficiency of aggregate spending.
C is incorrect. The full employment unemployment rate is the sum of frictional and structural unemployment. Full employment does not mean zero unemployment.
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