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Assume that you are responsible to propose a UML class diagram for a seminar handling system. Several details about the system as follows: 1. Instructors give seminars to students. 2. Students are enrolled in seminars in case they are eligible to enroll. 3. Every student gets a score from each seminar (assume that there is no exam). 4. Any of students can be dropped from seminar by instructor with/without any reason. 5. The system is capable to compute average score of any desired seminar and average seminars' score for a particular student. 6. The system also offer lists such as seminars taken by a students, seminars given by an instructor. Please propose a UML class diagram with all necessary associations, cardinalities and operational signatures according to details listed above. Please, clearly show required operations for each class, and please give exactly 3 of most important attributes (don't give more than 3) for each