Your customer’s Microsoft Lync Server 2013 environment is configured according to the following:
• Firewalls block all traffic between user subnets.
• Security policy prohibits any changes to firewall rules between user subnets.
The customer reports that:
• Users can share their desktop with others on the same subnet.
• Users are unable to share their desktop between users on different subnets.
You need to ensure that users can share their desktops between subnets.
What should you do?

A.
On the client computers, add an exception in Windows Firewall.

B.
Disable Windows Firewall on the Front End Server.

C.
Change the port range for Lync traffic.

D.
Have the firewall team open media ports between each user subnet and the Edge server.