Which of the following indicates that a creative work can become public domain?

The indication that a creative work can become public domain is accurately identified with the understanding of copyright laws. A work that is not subject to copyright protection can enter the public domain. This means that the work is not under any legal restrictions that could prevent others from using it freely. Works can fall into this category for various reasons, such as being created before copyright laws were established, not meeting the criteria for copyright protection, or because they were created by the U.S. federal government and thus are inherently public domain.

While other options relate to public domain concepts, they either deal with specific declarations, expiration of copyrights, or licensing conditions that do not inherently lead to public domain status.