These credits must be completed at the university level (no transfer credit for AP coursework or for other courses completed in high school apply).
If you have to take 6 credits of free electives then you should keep in mind that at most 3 credits can be at the 100-level and at most 3 credits can be a language course.
As an example, if you take SPAN 102 as a free elective then and you have to take another 3 credits of free electives then remaining credits have to be from a 200-level or higher course that is not a language course.
Of course, CPEN, ELEC, CPSC, MATH, or COMM courses can be taken as free electives.