Which of the following files contains III information?

The correct choice focuses on the Gang File, which is part of the Interstate Identification Index (III). This index is designed to provide criminal history information on individuals who have been arrested, and it encompasses various types of criminal intelligence, including gang affiliations. The III is intended to enhance the sharing of information related to offenses and arrests across jurisdictions, making the Gang File particularly significant in this context as it tracks gang-related activities and individuals who are part of such organizations.

The other options do not contain III information. For example, Vehicle Registration pertains to the registration details of automobiles and does not include criminal history. The National Security Index focuses on individuals who pose a potential threat to national security, distinct from the criminal history covered under the III. The Credit Fraud Database is specifically aimed at tracking fraudulent activities related to credit and finance, not criminal history as recorded in the III. Thus, the Gang File is the most relevant to the query regarding III information.