After confirming the removal of a virus, how should a technician ensure and verify full functionality of the system?

Ensuring and verifying full functionality of a system after virus removal is critical to restoring the system to its optimal performance. Checking for the latest operating system patches and updates is the correct approach because it addresses potential vulnerabilities that could have been exploited by the virus. Keeping the operating system updated with the latest security patches is essential for protecting against future threats and ensuring that all security measures are in place post-removal.

Regular updates not only fix security holes but also enhance the overall functionality of the operating system, including performance improvements and bug fixes. Therefore, confirming that the system has the latest updates helps ensure that it is equipped with the most secure and efficient software environment.

Other options may not be as effective in verifying full functionality in the context specified. For instance, reinstalling the operating system is a more drastic step that may not be necessary after confirming virus removal, and it would not directly verify the functionality of the current configuration. Running a malware scan is indeed helpful, but it primarily detects potential threats rather than confirming complete system functionality or security enhancements following an update. Resetting network settings might address specific connectivity issues, but it would not verify the overall system health or its protection against future vulnerabilities.