Answer:
Transactional Leadership Style
Step-by-step explanation:
Nelson is using the transnational leadership style. It is reward/punishment model.
Since Nelson hires and fires; he also gives work assignments, performance appraisals, and promotions, it clearly means that on one hand where he rewards the hard workers through promotions and appraisals, he also punishes them for not working up to the mar or slacking through firing them.
Therefore it is a transactional activity where the employee is treated on the basis of his performance.