You read an article that says that freshmen who live on campus have a 5% chance of contracting a contagious viral infection that requires them to miss at least one full week of classes. You follow the health of six randomly selected freshmen who neither live together nor are friends with one another. What is the probability that

a. Two or more of the six freshmen will contract a contagious viral infection that requires them to miss at least one full week of classes,

b. Exactly three of the six freshmen will contract a contagious viral infection that requires them to miss at least one full week of classes, and

c. None of the six freshmen will contract a contagious viral infection that requires them to miss at least one full week of classes?