Consider the domain model class diagram shown in Figure 4-16the refined diagram showing course enrollment with an association class. Does this model allow a student to enroll in more than one course section at a time? Does the model allow a course section to contain more than one student? Does the model allow a student to enroll in several sections of the same course and get a grade for each enrollment? Does the model store information about all grades earned by all students in all sections?

FIGURE 4-16 A refined university course enrollment domain model class diagram with an association class Course courseNumber itle creditHours CourseEnrollment grade CourseSection Student sectionNumber startTime roomNumber studentID 0.. name major