Explanation

Box 1:
No. User1 is in Group1. The two device type policies that apply to Group1 are Policy3 and the Default (All Users) policy. However, Policy3 has a higher priority than the default policy so Policy3 is the only effective policy. Policy3 allows the enrolment of Android and iOS devices only, not Windows.
Box 2:
No. User2 is in Group1 and Group2. The device type policies that apply to Group1 and Group2 are Policy2, Policy3 and the Default (All Users) policy. However, Policy2 has a higher priority than Policy 3 and the default policy so Policy2 is the only effective policy. Policy2 allows the enrolment of Windows devices only, not Android.
Box 3:
Yes. User3 is a device enrollment manager. Device restrictions to not apply to a device enrollment manager.
Reference:
https://docs.microsoft.com/en-us/intune/enrollment/enrollment-restrictions-set

When you configure conditions for a label, you can automatically assign a label to a document or email. In this case, we would create a label to label all email messages that contain the word ProjectX. We would then create a label policy to preserve a copy of all message that have the label assigned.
Reference:
https://docs.microsoft.com/en-us/azure/information-protection/configure-policy-classification

In a single tenant application, sign-in requests are sent to the tenant's sign-in endpoint. For example, for contoso.onmicrosoft.com the endpoint would be: https://login.microsoftonline.com/contoso.onmicrosoft.com. Requests sent to a tenant's endpoint can sign in users (or guests) in that tenant to applications in that tenant.
Reference:
https://docs.microsoft.com/en-us/azure/active-directory/develop/howto-convert-app-to-be-multi-tenant

Explanation
The SharePoint Migration Tool lets you migrate content to SharePoint Online and OneDrive from the following locations:
* SharePoint Server 2013
* SharePoint Server 2010
* Network and local file shares
Reference:
https://docs.microsoft.com/en-us/sharepointmigration/introducing-the-sharepoint-migration-tool