What should an information system display before allowing access?

An information system should display a System Use Notification before allowing access because it serves as a legal and informational disclaimer regarding the use of the system. This notification typically outlines the acceptable use policy, any monitoring activities that may occur, and users' responsibilities while accessing the system. It ensures that users are aware of their rights, the nature of the information they are accessing, and the legal implications of unauthorized use. This practice is particularly important in environments handling sensitive information, such as criminal justice, where compliance with regulations and security protocols is critical.

In contrast, the other options do not provide the necessary legal and informational framework required for responsible data access. A Windows Update Notification is unrelated to information system access and focuses on software maintenance. An HTTP Error 404 Message indicates that a requested resource is not found, which is unrelated to the authentication process. A Happy Birthday message, while positive, lacks any relevance to system use and does not serve the purpose of informing users about their responsibilities or the rules governing system access.