12. (14 points) Consider the following set of requirements for a UNIVERSITY database that is used to keep track of the courses offered by departments.bni Yhgong ayol pool bn sinistro Each department is described by a name, department code, office number, office phone. Both name and code have unique values for each department. Each course has a course name, description, course number, number of semester hours, level, and offering department. The value of course number is unique for each course. Each section has semester, year, course, and section number. The section number distinguishes different sections of the same course that are taught during the same semester/year, its values are 1, 2, 3, ..., up to the number of sections taught during each semester. [8 points) Draw an ER diagram for this application. In the diagram, specify key attributes of each entity type and constraints on each relationship type. Note any unspecified requirements, and make appropriate assumptions to make the specification complete