You have deployed Skype for Business Server 2015 in three locations, Boston, New York and Chicago. Users form the Boston

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You have deployed Skype for Business Server 2015 in three locations, Boston, New York and Chicago.
Users form the Boston location are reporting a delay in the audio stream during conferences and that the audio drops frequently. Users in the other two locations do not report the same issues.
You need to recommend a solution to resolve the audio issues for the users in the Boston office.
Which three possible recommendations should you include in the solution? Each correct answer presents a complete solution.

A. Call Admission Control (CAC)
B. user services
C. Quality of Service (QoS)
D. a location policy
E. a conferencing policy