You support a customer whose Microsoft Lync Server 2013 environment includes:
• a single Standard Edition Server,
• a single consolidated Edge Server, and
• a single Forefront Threat Management Gateway 2010 server that is acting as an HTTP(S)
reverse proxy.
Client computers are configured as shown in the following table:

Some users report that they are unable to participate in audio/video conferences by using the Lync
Web App. You need to ensure that users are able to participate in audio/video conferences by using
the Lync Web App. Which two actions should you perform? (Each correct answer presents part of
the solution. Choose two.)

A.
Install Microsoft Silverlight.

B.
Upgrade the operating system to Windows 7 Professional.

C.
Install the Lync Audio/Video ActiveX Plugin.

D.
Extract the MSI from the executable and run the install.