The correct answer is HIGH SCHOOL TEACHER.
A license or a certification is one of the major method that the government used to ensure that the right set of people are employed to do a particular job. Take teaching, nursing and doctoring for instance, these professionals render their services directly to the people and they have great impacts on the people they attending to, sometimes, the way they render their services to their customers determine whether these people will die or live. So, the government has to ensure that qualified and appropriate people are handling these jobs, that is why certificates and licences are needed to do these kinds of jobs.
