You are part of a system admin team for the DEF Company that has an enterprise network of 500 users and three Windows Server 2016 DCs. All users and DCs are contained within a single building. The company is adding three satellite locations that will be connected to the main site via a WAN link. Each satellite location will house between 30 and 50 users. One location has a dedicated server room where you can house a server and ensure physical security. The other two locations don’t have a dedicated room for network equipment. The WAN links are of moderate to low bandwidth.

Explain an Active Directory structure taking into account global catalog servers, FSMO roles, sites, and domain controllers. Please explain the features of DCs and Active Directory that would be used within your team's design. Please include 5 or more detailed sentences.