A company has a Skype for Business 2015 environment that consists of a single site. Client Version Configuration policie

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A company has a Skype for Business 2015 environment that consists of a single site. Client Version Configuration policies are disabled globally Employees. Some users report that they are missing some Skype for Business features and that they are not able to see multiple people in conferences. You must notify users.
You need to configure Skype for Business.
What should you do?

A. Enable the global Client Version Configuration policy.
B. Create a client policy for the internal users. Run the New-CsEdgeAllowList Skype for Business Management Shell cmdlet to notify external users.
C. Create a client Version Configuration policy for the internal users. Run the Set-CsAccessEdgeConfiguration Skype for Business Management Shell cmdlet to notify external users.
D. Create a client policy for the site that enforces versions.