What file maintains records of individuals on supervised release during their probation?

The Supervised Release File is the correct choice because it specifically maintains records of individuals who are under supervision while on probation. This file is essential for tracking compliance with the terms of probation, monitoring the progress and behavior of individuals who are reintegrating into the community, and ensuring public safety. It serves as a centralized database for law enforcement and probation officers to access critical information about the status of supervised individuals.

In contrast, the other files serve different purposes: the Protection Order File deals with records of individuals subject to restraining or protective orders, the National Sex Offender Registry is focused on tracking registered sex offenders for public safety and legal compliance, and the Immigration Violators File contains information about individuals who have violated immigration laws. Each of these files fulfills its own role within the broader context of law enforcement and public safety, but none specifically pertains to individuals on supervised release during probation as the Supervised Release File does.