Which of the following is true of Content ID?

Content ID is only available to channels with >1 million subscribers.
Content ID scans all uploads and removes portions that infringe copyright.
Content ID enables rights holders to block, track, or monetize uploads that use copyrighted content.
Content ID allows viewers to flag harmful or dangerous content.

The correct answer is:

Content ID enables rights holders to block, track, or monetize uploads that use copyrighted content.