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Overview
Litware. Inc. is an international manufacturing company that has 10,000 users. The company has two offices. The offices are located in New York and Denver.
The offices connect to each other by using a WAN link. Each office connects directly to the Internet.
Existing Environment

Active Directory Infrastructure
The network contains an Active Directory Domain Services (AD DS) forest named litware.com. The forest contains a single domain. All domain controllers run
Windows Server 2008 R2.
Lync Server 2013 Infrastructure
Litware has a Lync Server 2013 infrastructure in the New York office. The infrastructure contains servers and appliances. The call routing and distribution solution
for the IT Help Desk and Front Desk are dependent upon Response Groups. The servers and appliances are configured as shown in the following table.

All of the servers that have Lync Server 2013 deployed are monitored by using Microsoft System Center Operations Manager. All client computers have either
Microsoft Lync 2010 or Microsoft Lync 2013 installed. Administrators configure the following Lync Server 2013 features:
IM and Presence for all sites
External user access for IM and conferencing
Conferencing for all sites
Response groups
Group Chat
Problem Statements
Litware identifies the following issues:
Users report that other users who are not listed on their contact list can see their presence information. This also occurs when the users set their privacy mode to
allow only the users on their contact list to use their presence information.
Users report that when they connect to meetings remotely, they cannot use presenter controls.
Requirements
Planned Changes
Litware plans to upgrade to Skype for Business Server 2015 during the next six months.
You must implement the following changes during the upgrade:
Migrate the current Front End pool to an Enterprise Edition Front End pool named fepool1 that will contain two servers named Server13_01 and Server13_02.

Migrate Group Chat to Persistent Chat.
You must minimize the costs associated with the purchase of hardware and software.
Technical Requirements
You have the following technical requirements for the planned changes:
Users running previous client versions must be able to use chat features after the server is migrated to Persistent Chat.
Users who have mobile devices must be able to receive notifications if the Skype for Business mobile app on Windows Phone is inactive.
Aclient computer named Monitor01 must be used to monitor client connectivity by using synthetic transactions.
All response groups must be migrated to Skype for Business Server 2015.
External users must be able to expand distribution groups.
External users must be able to download meeting content.
The Lync Windows Store app must be supported.
Non-federated external partners must be able to join and present during meetings that Litware hosts.
High Availability Requirements
The new Skype for Business Server 2015 infrastructure in the New Your office must be available if a single server fails. You must minimize the amount of
administrative intervention that is required to recover from a single server failure. You must deploy an AlwaysOn Availability Group instance and a Distributed File
System (DFS) file share in the environment.
You need to recommend a solution to resolve the privacy issue that users report. What should you recommend?
A. a conferencing policy

B. a client version policy

C. a client policy

D. a presence policy

Explanation:
References:
https://technet.microsoft.com/en-us/library/gg398300.aspx

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