When Cris adds a user ID to an identity system, what process has he completed?

The process of adding a user ID to an identity system is best described as registration. During registration, a new user's information is collected and their unique identifier, such as a user ID, is created within the identity management system. This is a critical first step in establishing a user's identity within the system, allowing them to subsequently authenticate and gain access to resources based on the permissions assigned to that user ID.

Once registration is completed, the user can go through the authentication process, which involves verifying their identity using credentials like a password or biometrics. However, these steps occur after registration. While provisioning involves setting up the necessary access rights and permissions for the newly registered user, the act of adding the user ID itself refers specifically to the registration process. Therefore, the correct answer accurately reflects the initial phase of allowing a user to access a system.