Which of the following would be part of the release of information system?

The correct choice is a letter notifying the individual that the authorization was invalid because it directly pertains to the release of information process. In a release of information system, it is crucial to ensure that patient data is released only when proper authorization is obtained. If an authorization is found to be invalid for any reason—such as being expired, improperly signed, or lacking necessary details—the individual must be informed promptly. This step is essential to maintain compliance with health privacy laws, such as HIPAA, which safeguards patient information from unauthorized access.

The other options relate to various aspects of healthcare communication and management but do not encompass the specificity of release of information. For instance, asking for additional information or requesting clarification on a primary diagnosis can be part of ongoing clinical assessments, whereas notifying a physician about delinquent records pertains more to internal quality assurance and accountability within the healthcare system. Hence, they do not fit within the framework of information release processes designed to manage patient data disclosures.