If one department chair—a professor—can chair only one department, and one department can have only one department chair. the entities professor and department exhibit a(n) relationship.

1:1

Explanation:

According to my research on different types of relationships between two variables, I can say that based on the information provided within the question the entities PROFESSOR and DEPARTMENT exhibit a 1:1 relationship. In other words there can only be one Professor per Department and vice-versa.

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