A fitness club offers many classes, each of which has attributes (ClassID, ClassDesc, ClassSchedule). The ClassSchedule is a composite attribute consisting of (ClassDate, ClassTime). Each class is taught by one instructor who has attributes (InsID, InsName). One instructor can teach multiple classes while each class is taught by only one instructor. Some instructor may have never taught any class yet. The club also records information about its members, each of which has attributes (MemberID, MemberName, MemberAddress). A class should have at least one members attending it. Some members do not attend any class while some may attend multiple classes. Do the following: 1) Draw an Entity-Relationship diagram (ERD) for the above situation. Choose identifiers as appropriate. You should clearly represent the entity type names, relationship names, attributes, identifiers, cardinality constraints, etc. in you ERD.
2) Assume that a member can leave a feedback for a class she attended or is attending (it is optional). Introduce an associative entity type to model feedback and redraw the ERD. You only need to redraw the part about customer, class, and feedback.