Your network contains an Active Directory domain named contoso.com. The domain contains a Virtual Desktop
Infrastructure (VDI). The VDI contains three servers. The servers are configured as shown in the following
table.

You need to identify the last 30 users who attempted to connect to a virtual desktop.
What should you do?

A.
On Server1, create a Data Collector Set (DCS) by using Performance Monitor.

B.
On Server1, run rdvdiag.exe.

C.
On Server2 and Server3, run rdvdiag.exe.

D.
On Server2 and Server3, create a Data Collector Set (DCS) by using Performance Monitor.

Explanation:
Found in a MS .doc file concerning the troubleshooting of VDI deployment:
RDVDiag must be run on the Connection Brokerserver that is used to managed the deployment using
RDMS.
The Connections tab in rdvdiag.exe lists all of theconnections to the collections in the deployment. Click Start
to list the
last 30 connections and display the ConnGuid field,which is the Connection GUID for that connection

http://www.virtualizationadmin.com/kbase/VirtualizationTips/DesktopVirtualization/
MicrosoftVirtualDesktopInfrastructureTips/General/RDVDiagadiagnosticstoolforRDSdeployments.html