PDD Practice Exam 1, Question 12 - ID#63842

I’m confused by the correct answer to this question. Based on the Construction Documents Standards Part 2 video, I understood that the correct answer should be the ConDoc system, but none of the answer choices include ConDoc.

Instead, the answer given is keynotes, which I understand to be a different material labeling system.

Could someone clarify why keynotes is considered the correct answer here?