Using CHEN Notation, you are required to fix $($re$-$create and make changes$)$ the ERD by

taking into consideration the following extended Entity$-$Relationship features$/$business rules:

$$ PostGrad ISA Student with Advisor and YearStarted as attributes, whereas UnderGrad ISA

Student with Major, Section, and Level attributes. Section is a composite attribute with sec$01,$

sec$02,$ and sec$03.$

$$ A student is either a PostGrad or UnderGrad, but not both, at any moment.

$$ Tutor ISA PostGrad with PayPerHr, Hours, and TotalPay as attributes. TotalPay is derived from Hrs

worked and PayPerHr for each specific tutor.

$$ TA ISA PostGrad with Course, Topic, and Date attributes. PostGrad can be both Tutor and TA at

any time.

$$ A student has StudentNo, Name, Faculty, and Phone as attributes. The phone attribute in the

student entity allows more than one phone number to be entered into the database.

$$ Every PostGrad in the database must appear either as Tutor or TA$.$

$$ Lastly, a student may enroll in many courses, and at least one student takes one course.