Concept:Underemployment occurs when a person is working in a job that does not fully use their skills, qualifications, or capacity.Explanation:An electrical engineer is professionally trained and qualified in electrical engineering.Teaching physics in a secondary school is a job, so the person is employed and not unemployed.However, this teaching job does not make full use of the engineer's specialised engineering skills and training.Thus, the engineer is working below their skill level, which is a clear case of underemployment.Answer:A. under-employed