Which of the following is an example of a common integration system?

The correct choice, which is the authentication system, is categorized as a common integration system because it plays a critical role in ensuring secure access to applications and data across various platforms. When multiple systems and services need to interact, they often rely on a centralized authentication system to manage user identities and access permissions consistently. This integration is essential in maintaining security protocols while also simplifying the user experience by allowing single sign-on (SSO) capabilities.

In contrast, while database management systems, data visualization tools, and web analytics services serve important functions within an organization, they do not specialize in integrating and managing user authentication across multiple systems. A database management system is more focused on handling data storage and querying; a data visualization tool is primarily concerned with presenting data insights visually; and a web analytics service analyzes website traffic and user behavior. Although each of these systems can be integrated with others, they don't function as primary integration systems for user authentication, making the authentication system the more relevant example in this context.