Which user synchronization option should you recommend?

HOTSPOT
You are a SharePoint Administrator at Contoso, Ltd. The company acquires WingTips Toys, which has its own SharePoint farm. Each company will keep its existing Active Directory.
You need to recommend methods to synchronize users.
For each activity, which user synchronization option should you recommend? To answer, select the appropriate option from each list in the answer area.
NOTE: Each correct selection is worth one point.
Hot Area:

Correct Answer:

Explanation/Reference:
References:
https://docs.microsoft.com/en-us/sharepoint/administration/install-microsoft-identity-manager-for-user-profiles-in-sharepoint-server-2016 https://docs.microsoft.com/en-us/SharePoint/install/create-a-user-profile-service-application