7. A database at a college is required to support the following requirements. Complete the information-level design for this set of requirements. Use your own experience to determine any constraints you need that are not stated in the problem. Represent the answer in DBDL.

a. For a department, store its number and name.

b. For an advisor, store his or her number and name and the number of the department to which he or she is assigned.

c. For a course, store its code and description (for example, MTH110 or Algebra).

d. For a student, store his or her number and name. For each course the student has taken, store the course code, course description, and grade received. In addition, store the number and name of the stu- dents advisor. Assume that an advisor may advise any number of students but that each student has just one advisor.