Question: Which accurately describes how copyright applies to a remix or mashup?
- These are protected by fair use, so you don’t need permission from the original content creators.
- These have not been defined under current copyright law, so it’s unclear.
- These are considered original works, so you would own the copyright.
- These can be considered derivative works under the law, and you may need permission from the original content creators.
Explanation
A remix or mashup usually builds on existing protected material, so copyright can still apply to the original works. This kind of adaptation may be treated as a derivative use because it transforms or combines existing expression. Permission may be required from the relevant rights holders before uploading or monetizing the new version. In Content ID, using third-party material without the required rights can lead to claims or removal requests.
Why the other options are incorrect
Fair use is incorrect because remixing or mashing up content is not automatically protected by fair use.
Undefined law is incorrect because copyright law can address adaptations based on existing works.
Original works is incorrect because adding creative changes does not automatically transfer ownership of the underlying material.
Source for verification
https://support.google.com/youtube/answer/2797466
https://support.google.com/youtube/answer/2797449
The answer(s) to the question is highlighted in the BOLD text above. You can also find more questions and answers related to the exams on the "YouTube Content Ownership" page.

whts the answer ??
Updated
LuL, None of this answers is marked as Right ¯\_(ツ)_/¯
Updated.