What are two possible ways to achieve this goal?

Your customer recently installed Microsoft Lync Server 2013 in his company network and he is
migrating users from Office Communications Server (OCS) 2007 R2. Some users who have been
moved to Lync server but still have the OCS client installed report that they receive the following
error when trying to connect: “Microsoft Office Communicator 2007 R2 is not a version that can be
used to sign in to the server. Please contact your system administrator to get the required version.”
You need to ensure that Microsoft Office Communicator 2007 R2 clients can connect to the Lync
server. What are two possible ways to achieve this goal? (Each correct answer presents a complete
solution. Choose two.)

A.
Run the Set-CsClientVersionConfiguration -Enabled $false cmdlet.

B.
Install the latest Microsoft Office Communicator 2007 R2 update.

C.
Run the Get-CsClientVersionPolicyRule | Where-Object {$_.UserAgent -eq “CPE”} | SetCsClientVersionPolicyRule -MajorVersion 0 -MinorVersion 0 -BuildNumber 0 -Action Allow cmdlet.

D.
Enter a new registry entry on the client computers:
HKEY_CURRENT_USER\Software\Policies\Microsoft\Communicator Name: DisableServerCheck Type:
DWORD Value: 1 (00000001)