A User registry was created in the Cloud Manager. In order for the registry to be used on the Developer Portal, what must be completed?

For a User Registry created in the Cloud Manager to be used by a specific Developer Portal, it must be associated with the Catalog that the portal belongs to. This is done in the Catalog settings within the API Manager UI. Specifically, under the "Portal" -> "Onboarding" configuration for the Catalog, the administrator must add the desired User Registry. This action makes the registry available for developer self-service onboarding and subsequent authentication on that portal.

B. User registries are not made "public" in the API Manager resources page. Their visibility and use are controlled at the Catalog level.
C. The User Registry is not chosen directly on a "Portal settings page." The association is managed through the Catalog settings in the API Manager.
D. The "resources settings" on a Catalog are for configuring gateway services and other infrastructure, not for managing user registries for the portal.

- IBM API Connect v10.x Documentation, "Configuring the settings for your Developer Portal". This page details the process, stating: "In the Cloud Manager, click Catalogs... Select the Catalog that you want to work with... Click the Portal tab, then click Onboarding... you can specify the registries that API consumer can use to register."

- IBM API Connect v10.x Documentation, "User registries for authenticating". This section explains that registries are configured for a catalog to enable users to register and log in to the associated Developer Portal.