Question: [4] Please draw an ERD based on following description. Each professor (attributes: ID, Name, rank) may teach up to four classes. Each classes is a

[4] Please draw an ERD based on following description.

Each professor (attributes: ID, Name, rank) may teach up to four classes. Each classes is a section (attribute: Section ID) of a course (course ID, title). A professor may also be on a research contract and teaches no classes at all. Each class is taught by a professor.

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