To register and authenticate new customers on the website using Salesforce Identity, the identity architect should use Delegated Authentication and Embedded Login. Delegated Authentication is a feature that allows Salesforce to delegate the authentication process to an external service, such as a custom website, instead of validating the username and password internally. Embedded Login is a featurethat allows Salesforce to embed a login widget into any web page, such as a custom website, to enable users to log in with their Salesforce credentials. The other options are not relevant for this scenario. References: Delegated Authentication, Embedded Login

The update User() methodonthe Registration Handler class is used to update the Salesforce user record with information from the Facebook profile, such as name, email, and photo1. This method is invoked every time a user logs in to Salesforce using Facebook credentials2. The other options are not suitable for this requirement because:
* SAML Just-In-Time Provisioning is used to create or update users in Salesforce based on SAML assertions from an identity provider3. Facebook does not support SAML as an identity provider.
* The Signed Request is a parameter that contains information about the user who is logging in to Salesforce via Facebook. It does not contain the user's profile information, such as name, email, or photo.
* A scheduled job that calls out to Facebook on a nightly basis would not reflect the changes in the Facebook profile in real time, as the requirement states. It would also require storing the user's Facebook access token and making API calls to Facebook,which could be inefficient and insecure.
References: Set Up Social Sign-On, Configure a Facebook Authentication Provider, SAML Just-in- Time Provisioning, [Facebookas a SAML Identity Provider], [Facebook Login for Apps - Signed Request], [Facebook Login for Apps - Access Tokens], [Facebook Graph API - User]

To ensure that SSO is usedfor accessing the Salesforce1 mobile app, UC should configure the Salesforce1 app to use the My Domain URL instead of the default login.salesforce.com URL. My Domain is a feature that allows UC to create a custom domain name for their Salesforce org that supports SSO with their identity provider. UC should also use the existing SAML-SSO flow along with User Agent Flow, which is an OAuth
2.0 flow that allows users to authenticate with their identity provider through an embedded browser within the mobile app.Verified References: [Configure SSO with Salesforce as a SAML Service Provider], [User-Agent Flow]

AD groups can control public group assignment, role assignment, and permission set assignment through Identity Connect. Identity Connect is a tool that integrates Microsoft Active Directory (AD) user accounts with Salesforce user records1. It allows Salesforce admins to leverage the existing user data and group memberships in AD to automate user provisioning and deprovisioning in Salesforce. Identity Connect can map AD groups to Salesforce publicgroups, roles, and permission sets, and assign them to users based on their group membership2. This way, AD groups can control the access level and visibility of users in Salesforce.
AD groups cannot control granting report folder access or custom permission assignment through Identity Connect. These are not supported features of Identity Connect. Report folder access is controlled by the folder sharing settings in Salesforce. Custom permission assignment is controlled by the custom permission settings in Salesforce. References: Get to Know Identity Connect, Map Your Data, [Folder Sharing], [Custom Permissions]

Using Custom Login Flows with Apex is the best option to force users to authenticatewith 2FA for Salesforce only when not connected to an internal company network. Custom Login Flows allow admins to customize the login process for different scenarios and user types2. Apex code can be used to detect the user'sIP address and prompt for 2FA if it is not within the company's network range3. The other options are not suitable because they either do not support 2FA or do not allow conditional logic based on the user's IP address.