What does the NCIC Denied Transaction File (NDTF) share information about?

The NCIC Denied Transaction File (NDTF) is designed specifically to provide information regarding individuals who are prohibited from purchasing firearms under various handgun violence prevention laws. This includes individuals who have been denied transactions based on criteria established by federal, state, and local laws. The NDTF serves as a critical resource for law enforcement to monitor and enforce laws pertaining to gun ownership restrictions.

The other options represent categories of individuals that may be relevant in various law enforcement contexts, but they do not pertain specifically to the purpose of the NDTF. For example, while sex offenders, criminal aliens, and domestic violence offenders are important for background checks and monitoring, they are not the specific focus of the NDTF, which is aimed at those who are denied firearms transactions due to legal prohibitions. Thus, the focus of the NDTF on prohibited persons under handgun violence prevention laws makes it the correct answer.