3. (15 pts.) Consider the following relational schema Faculty(fid: integer, fname: string, deptid: integer) Student(snum: integer, sname: string, major: string, level: string, age: integer) Class(name:string, meets_at: time, room: string, fid: integer) Enrolled(snum: integer,cname: string) Enrolled has one record per student-class pair such that the student is enrolled in the class. Write an SQL assertion for the following integrity constraint: "Every faculty member must teach at least two courses