HOTSPOT
You have an Exchange Server 2013 organization and a Microsoft SharePoint Server 2013 server farm.
The SharePoint server farm contains the servers shown in the following table:
You plan to use a SharePoint eDiscovery Center.
You need to recommend which component must be deployed before you can use the SharePoint eDiscovery
Center for In-Place eDiscovery.
What should you recommend? To answer, select the appropriate options in the answer area.
Hot Area:
Answer: 
Explanation:
You must ensure that the Exchange Web Service managed API is installed on every front-end server that is
running SharePoint Server 2013.
Configure eDiscovery in SharePoint Server 2013
https://technet.microsoft.com/en-us/library/fp161514.aspx