$[25$ points$]$ Consider the following description of some university where professors teach

courses in which students can enroll. A teacher has a name, address, phone number, email

address, and salary. A student has also a name, phone number etc., but no salary $($sorry$).$ A

student also gets some marks by enrolling in each course. Each course has a name and a number.

When a student is enrolled in a course, the marks for this enrollment are recorded and the

current average as well as the final marks can be obtained from the enrollment. From a student

one can obtain a list of courses he or she is enrolled in$.$ Each course has at least one and at most

three teachers. There are two types of courses: undergraduate and graduate. Students cannot

withdraw from an undergraduate course once enrolled, but from a graduate course they can.

Draw a class diagram for this university. Include the necessary class associations and their

multiplicities. Add attributes and methods when necessary. You do not have to include getters

and setters for attributes. Also visibility modifiers $($public$,$ private, etc.$)$ are not required.

Please physically draw the diagram with neat handwriting $($digital drawing okay$).$ Don't forget multiplicities!