You have a failover cluster named Cluster1 that contains four nodes.
All of the nodes run Windows Server 2012 R2.
You need to force every node in Cluster1 to contact immediately the Windows Server Update Services (WSUS) server on your network for updates.
Which tool should you use?

A.
The Add-CauClusterRole cmdlet

B.
The Wuauclt command

C.
The Wusa command

D.
The Invoke-CauScan cmdlet

Explanation:
A)
Adds the Cluster-Aware Updating (CAU) clustered role that provides the self-updating functionality to the specified cluster.
B)
the wuauclt utility allows you some control over the functioning of the Windows Update Agent
C)
The Wusa.exe file is in the %windir%\\System32 folder. The Windows Update Standalone Installer uses the Windows Update Agent API to install update
packages.
Update packages have an .msu file name extension. The .msu file name extension is associated with the Windows Update Standalone Installer.
D)
Performs a scan of cluster nodes for applicable updates and returns a list of the initial set of updates that would be applied to each node in a specified cluster.
http://technet.microsoft.com/en- us/library/hh847235(v=wps.620).aspx
http://technet.microsoft.com/en- us/library/cc720477(v=ws.10).aspx
http://support.microsoft.com/kb/934307
http://technet.microsoft.com/en-us/library/hh847228(v=wps.620).aspx