The three capabilities of delegatedauthentication are:
* It can connect to SOAP services. Delegated authentication is a feature that allows Salesforce to delegate the authentication process to an external service by making a SOAP callout to a web service that verifies the user's credentials.This feature enables Salesforce to integrate with existing identity stores or authentication methods that support SOAP services.
* It can be assigned by permission sets. Permission sets are collections of settings and permissions that give users access to various tools and functions in Salesforce. Permission sets can be used to assign delegated authentication to users by enabling the "Is Single Sign-on Enabled" permission. This permission allows users to log in with delegated authentication instead of their Salesforce username and password.
* It can connect to REST services. REST services are web services that use HTTP methods to access or manipulate resources on a server. REST services can be used for delegated authentication by creating a custom login page that makes a REST callout to an external service that verifies the user's credentials.
This approach requires custom code and configuration, but it provides more flexibility and control over the authentication process.
The other options are not capabilities of delegated authentication. Delegated authentication cannot be assigned by custom permissions or profiles. Custom permissions are settings that can be used in Apex code or validation rules to check whether a user has access to a custom feature or functionality. Custom permissions cannot be used to enable delegated authentication for users. Profiles are collections of settings and permissions that determine what users can do in Salesforce. Profiles cannot be used to enable delegated authentication for users,as this feature is controlled by permission sets. References: [Delegated Authentication], [Permission Sets], [Enable 'Delegated Authentication'], [REST Services], [Custom Login Page for Delegated Authentication], [Custom Permissions], [Profiles]