[C5] You need to recommend a solution to prevent calls to the Boston office from being routed over the PSTN. The solution must meet the Lync Server requirements. What should you include in the recommendation?
A. A Lync Server 2013 Director pool
B. Two Lync Server 2013 trunks
C. Two Lync Server 2013 Edge Servers
D. A Lync Server 2010 A/V Conferencing pool
