You are configuring a SharePoint farm in an environment that includes Microsoft Exchange Server 2013. You need to ensure that specified SharePoint users can search the Exchange mailboxes of all employees, place holds on mailbox data, and export mailbox data. What should you do first?
A. Create an external content type for Exchange mailbox information.
B. Configure server-to-server authentication between SharePoint and Exchange.
C. Create an external list for Exchange mailbox information.
D. Configure forms-based authentication between SharePoint and Exchange.