Your network contains an Active Directory domain named contoso.com.
You deploy Remote Desktop Services (RDS) and publish multiple RemoteApp programs.
You need to ensure that users can subscribe to the RemoteApp and Desktop Connections feed by using their
email address.
Which resource record type should you add to the DNS zone?
To answer, select the appropriate resource record type in the answer area.
Answer: 
Explanation:
http://technet.microsoft.com/en-us/library/hh831442.aspx
To configure DNS feed lookup for RemoteApp and Desktop Connection
Log on to the domain controller as the CORP\Administrator user account.
On the domain controller, open DNS Manager. Click Start, type DNS, and then click DNS.
Right-click the forward lookup zone where you want to create the TXT record, and then click Other New
Records.
Click Text (TXT), and then click Create Record.
In the Record name (use parent domain if left blank) box, type _msradc.
In the Text box, type https://RDWA1.corp.contoso.com/RDWeb/Feed.
Click OK.