4. (15 points, 5 points each) This problem explores functions from set X to set Y given below. X={1,2, 3, 4, 5 } Y={a,b, c} For each property, indicate whether or not it is possible to have a function from set X to set Y that exhibits the property. If it is possible, give an example of such a function. If it is not possible, explain why it is not possible. a. one-to-one b. onto c. a function that is neither one-to-one or onto