Draw a class diagram based on the following requirements:

All instructors consist of professor, associate professor, and assistant

professor.

Departments offer many courses, but a course is offered by one or

more department.

Courses are taught by instructors, who may teach up to three

courses.

Instructors are assigned to one department.

One instructor may chair a department.

Extend the class diagram to include the following attributes:

A department includes the department ID $($private$),$ department name

$($public$),$ and description about the department $($public$)$

An instructor includes the instructor ID $($private$),$ instructor name

$($public$)$ and department

A course includes the course ID $($private$),$ course name $($public$).$

course description $($public$),$ and prerequisite course $($protected$)$

Extend the class diagram to include the following operations:

Instructors can

Select course

Prepare course plan