Answer:
Negative reinforcment.
Explanation:
In negative reinforcement, the act of exerting negative behavior to extinguish the other is used. In the case of the issue, when Fred shouts at his employees when they perform poorly, he seeks to reinforce through a negative stimulus (the scream) to remove negative behavior from poor performance. But the opposite also occurs when there is good performance of employees and there is no positive reinforcement or the possibility of applying negative stimulus, then there are no stimuli for the expected behavior.