DDEX is NOT part of the Content ID matching process.
DDEX is a music industry-standard delivery method, and on YouTube, it allows you to create Art Tracks for YouTube Premium, upload music videos, and manage rights to sound recordings and/or music videos in Content ID. It has no role in the Content ID matching process.
References, Claims and Assets are an integral part of the Content ID matching process.
This question is a part of the YouTube Music Rights Management Certification Exam. You can get answers to all the questions asked in this exam on our YouTube Music Rights Management Certification Assessment Answers page.