Creating an EER diagram using Chen ERD notation

The requirements for the part of the UNIVERSITY database shown are the following:

The database keeps track of three types of persons: employees, alumni, and students. A person can belong to one, two, or all three of these types. Each person has a name, SSN, sex, address, and birth date.

Every employee has a salary. For each alumnus, a record of the degree or degrees that he or she earned at the university is kept, including the name of the degree, the year granted, and the major department. Each student has a major department.

Draw an EER Diagram based on the requirements above. Write down any assumptions you have made.