The correct answer is option 1: Structural unemployment. This refers to a type of unemployment that occurs when there is a mismatch between the skills or qualifications of available workers and the requirements of available jobs. In other words, there is a disconnect between the regional or occupational pattern of job vacancies and the pattern of worker availability.

Option 2: Disguised unemployment refers to a situation where workers appear to be employed, but they are not actually contributing significantly to the production process. This is typically seen in sectors where there is excess labor and workers are underutilized.

Option 3: Altered unemployment is not a recognized term in economics, and does not accurately describe the situation described in the question.

Option 4: Cyclical unemployment refers to unemployment that occurs as a result of fluctuations in the business cycle. It is caused by a decrease in aggregate demand and generally occurs during economic downturns.

Therefore, the correct answer is option 1: Structural unemployment, as it accurately describes the situation where the mismatch in the regional or occupational pattern of job vacancies and the pattern of worker availability leads to unemployment.