Given the following assertions for a database at a university, draw an ER diagram (Data Modeling) for this schema. Specify key attributes of each entity type and specify all the constraints (mandatory or optional participation, 1-to-many, 1-to-1, many-to-many) on each relationship type. Instructors are identified by empID. Courses are identified by courseID. Students are identified by stuID. a. An instructor may teach one or more courses. b. An instructor must supervise the research of at least one student or more. Each student will have one or two instructors to supervise his/her research. c. A course may have none, one, or two prerequisites. d. A course may exist even if no students are currently enrolled. The average enrollment in a course is 30 students. e. All courses are taught by exactly one instructor. f. Each student enrolls in at least one (but no more than 6) and receives a final grade for each course