HOTSPOT
You have a server named Server1 that runs Windows Server 2016. Server1 has the Web Application Proxy
role service installed.
You need to publish Microsoft Exchange Server 2013 services through the Web Application Proxy. The solution
must use preauthentication whenever possible.
How should you configure the preauthentication method for each service? To answer, select the appropriate
options in the answer area.
Hot Area:
Answer: 
Explanation:
The following table describes the Exchange services that you can publish through Web Application Proxy and
the supported preauthentication for these services:
https://technet.microsoft.com/en-us/library/dn528827(v=ws.11).aspx
Exchange ActiveSync cán use ADFS Preauthentication since windows 2016.
Frankw is correct ActiveSync can be used with ADFS:
https://docs.microsoft.com/en-us/windows-server/remote/remote-access/web-application-proxy/publishing-applications-with-sharepoint%2c-exchange-and-rdg