A college course may have one or more scheduled sections; or may not have a scheduled section. Attributes of COURSE include Course ID, Course Name and Units. Attributes of SECTION include Section Number and Semester ID. Semester ID is composed of two parts: Semester and Year. Section Number is an Integer (such as 1 or 2) that distinguishes one section from another for the same course but does not uniquely identify a section. Draw and ERD for this situation.