Which two solutions should you recommend?

You have a Lync Server 2013 infrastructure that contains four servers. The servers are configured as shown in the following table.

The Lync Server infrastructure contains a hardware load balancer name HLB1. The company has an IP-PBX. The IP-PBX supports media bypass. The IP PBX has a SIP trunk configured. Each user has a desktop phone that connects to the IP-PBX. Each laptop user has a Lync-certified headset. The company plans to implement Enterprise Voice and to use existing SIP trunks. You need to recommend a Mediation Server deployment that meets the following requirements:
Remote users must be able to place calls to any desk phone if a single server fails. The degradation of call quality must be minimized during peak usage hours. Which two solutions should you recommend? (Each correct answer presents a complete solution. Choose two.)
A. Create a Mediation Server pool that contains HLB1.
B. Install the Mediation Server role on Server1 and Server2.
C. Install the Mediation Server role on Server3 and Server4.
D. Create a Mediation Server pool that contains Server2 and Server4.
E. Create a Mediation Server pool that contains two new servers.

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