Convert each of the following ER diagrams into a relational model. Please be sure to list all the tables and attributes, and clearly specify primary keys and foreign key references.

Note: Please use proper notation when listing tables in your relational schemas. For example:

Instructor $($InstructorID$,$ Lname, Ename, Office$)$

PK: InstructorID.

Course $($CourseID$,$ Title, Credits, InstructorID$)$

PK: CourseID

FK: InstructorID references Instructor$($InstructorID$)$

$1.$