A course contains one or more class sections, and each class section belongs to only one course.

A course contains zero or more lab sections, and each lab section belongs to only one course.

A class section contains one or more students, and each student is enrolled in one or more class sections.

A lab section contains one or more students, and each student is enrolled in zero or more lab sections.

Each class section is taught in one room, and each room is used to teach one or more class sections of one or more courses.

Each lab section is taught in one or more labs, and each lab is used to teach one or more lab sections of one or more courses.

Important: for submission, model only the entities that you find and the relationships between them. Do not model attributes