c$.$ A college course may have one or more scheduled sections or may not have a scheduled section during a semester. 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 $1$ and $2)$ that distinguishes one section from another for the same course but does not uniquely identify a section.