Reference:
https://docs.microsoft.com/en-us/office365/securitycompliance/retention-policies EU PII wants both documents and email message to be preserved so S&C Admin Center for Retention. If this was for Email only, this probably could have been done in EAC.
Topic 1, A Datum
Existing Environment
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Current Infrastructure
A) Datum recently purchased a Microsoft 365 subscription.
All user files are migrated to Microsoft 365.
All mailboxes are hosted in Microsoft 365. The users in each office have email suffixes that include the country of the user, for example, [email protected] or user2#uk.ad3tum.com.
Each office has a security information and event management (SIEM) appliance. The appliances come from three different vendors.
A) Datum uses and processes Personally Identifiable Information (PII).
Problem Statements
Requirements
A) Datum entered into litigation. The legal department must place a hold on all the documents of a user named User1 that are in Microsoft 365.
Business Goals
A) Datum warns to be fully compliant with all the relevant data privacy laws in the regions where it operates.
A) Datum wants to minimize the cost of hardware and software whenever possible.
Technical Requirements
A) Datum identifies the following technical requirements:
Centrally perform log analysis for all offices.
Aggregate all data from the SIEM appliances to a central cloud repository for later analysis.
Ensure that a SharePoint administrator can identify who accessed a specific file stored in a document library.
Provide the users in the finance department with access to Service assurance information in Microsoft Office 365.
Ensure that documents and email messages containing the PII data of European Union (EU) citizens are preserved for 10 years.
If a user attempts to download 1,000 or more files from Microsoft SharePoint Online within 30 minutes, notify a security administrator and suspend the user's user account.
A security administrator requires a report that shows which Microsoft 36S users signed in Based on the report, the security administrator will create a policy to require multi-factor authentication when a sign in is high risk.
Ensure that the users in the New York office can only send email messages that contain sensitive US. PII data to other New York office users. Email messages must be monitored to ensure compliance. Auditors in the New York office must have access to reports that show the sent and received email messages containing sensitive U.S. PII data.

Explanation

Box 1: The Azure AD Connect provisioning agent
Install the Azure AD Connect provisioning agent
How is Azure AD Connect cloud sync different from Azure AD Connect sync?
With Azure AD Connect cloud sync, provisioning from AD to Azure AD is orchestrated in Microsoft Online Services. An organization only needs to deploy, in their on-premises or IaaS-hosted environment, a light-weight agent that acts as a bridge between Azure AD and AD. The provisioning configuration is stored in Azure AD and managed as part of the service.
Box 2: Server1 or Server2 only.
Cloud provisioning agent requirements include:
* An on-premises server for the provisioning agent with Windows 2016 or later.
This server should be a tier 0 server based on the Active Directory administrative tier model. Installing the agent on a domain controller is supported.
Note: Windows Server Core is a minimal installation option for the Windows Server operating system (OS) that has no GUI and only includes the components required to perform server roles and run applications.
Reference:
https://docs.microsoft.com/en-us/azure/active-directory/cloud-sync/how-to-install
https://docs.microsoft.com/en-us/azure/active-directory/cloud-sync/how-to-prerequisites

Explanation:

Reference:
https://techcommunity.microsoft.com/t5/microsoft-defender-for-endpoint/demystifying-attack-surface-reduction-