Your network contains an Active Directory domain named contoso.com. The domain has Remote Desktop
Services (RDS) deployed. The domain contains six servers. The servers are configured as shown in the
following table.

You plan to configure Server6 as an additional RD Connection Broker in the RDS deployment.
You need to identify which servers require the SQL Server Native Client installed.
Which servers should you identify? (Each correct answer presents part of the solution. Choose all thatapply.)

A.
Server1

B.
Server2

C.
Server3

D.
Server4

E.
Server5

F.
Server6

Explanation:
http://blogs.msdn.com/b/rds/archive/2012/06/27/rd-connection-broker-high-availability-in-windows-server-2012.
aspx
Install SQL Client on all the RD Connection Broker servers so that they can communicate with the SQL Server.