Explanation

Structural unemployment arises from a mismatch between the pattern of job vacancies and the pattern of worker availability — by region, occupation or skill — so workers cannot fill the jobs that exist. Disguised unemployment is hidden surplus labour (e.g., extra workers on a farm with zero marginal product), while cyclical unemployment follows business-cycle downturns. 'Altered unemployment' is not a recognised economics concept. The question describes a structural mismatch, so the answer is structural unemployment.