subj code

course number

course name

course description

credits

For the COURSE entity, the following are known to be candidate keys:

subj code and course number together;

course name; and

course description.

The following is additional information known about the candidate key attributes.

subj code and course number is always required for all courses, and change is rare

course name is always required for all courses, but the change is more frequent than course number to reflect current understanding.

course description is always long text description and change is more frequent than course name to reflect updates made to the course content

Based on the above information, select all choices that meet the necessary criteria to serve as a primary key.

course number

course name

course description

subj code and course number together

subj code

credits