DRAG DROP
Your network contains an Active Directory domain named contoso.com. The domain
contains four servers named Server1, Server2, Server3, and Server4. The domain contains
a RemoteApp farm. You install the Remote Desktop Connection Broker role service on
Server1 and Server2. You need to recommend a Remote Desktop solution to ensure that
users can reconnect to existing sessions if a single server fails. What should you
recommend deploying on Server3 and Server4? To answer, drag the appropriate software to
the correct server in the answer are a. Each software may be used once, more than once, or
not at all. Additionally, you may need to drag the split bar between panes or scroll to view content.
Answer: 
Explanation:
Server3
Box 1: Microsoft SQL Server 2012
Box 2: Failover clustering
Server4
Box 1: Microsoft SQL Server 2012
Box 2: Failover clustering
Note:
* One requirement for RD Connection Broker high availability is the use of SQL Server.
*
Configure RD Connection Broker in Windows Server 2012 with SQL Server 2012 AlwaysOn
Failover Cluster Instances: