Identify which type of machine learning would be most helpful in each scenario. Semi - supervised Evelyn needs to train a system to determine the best timing for a network of traffic light signals. Reinforced Terrance needs to train a system to identify patients whose symptoms indicate various common diagnoses. Supervised Leo needs to train a system to identify unexpected relationships between customer demographics and the products that they purchase. Unsupervised Malia needs to train a system to detect indications of fraud using both known and unknown techniques based on the limited dataset of known fraud techniques