Which User Layer requires the least amount of administrative effort to store user settings limited to Microsoft Outlook data and settings for a hosted shared desktop solution based on Windows Server 2012?

Scenario: A Citrix Engineer is managing a large environment with multiple locations. The setup is as follows:
- The setup has a single Citrix Virtual Apps and Desktops site with multiple zones such as a Primary zone and 3 Satellite zones.
-Virtual Delivery Agents (VDAs) are available for all applications in all 3 Satellite zones.
-An application 'app1' has its application database located in Satellite zone.
-As a sovereign mandate, it is desirable that this application database should NOT be accessible from zones 2 and 3.
-The application does NOT create any database cache and cannot work if the database is NOT reachable. - The outage is acceptable for complying with the sovereign mandate.
Which zone preference should the engineer configure to achieve this setup?

Which service on the StoreFront server is responsible for replication of user subscriptions?

What is the first step that the Enterprise Layer Manager (ELM) server takes when creating application layers?

Which two components should be managed by the customer as per Citrix recommendations, in order to move an existing on-premises Citrix Virtual Apps and Desktops environment to Citrix Cloud? (Choose two.)