Which two pieces of information should you collect when you perform usage modeling?

Your company corporate telephony environment is a combination of Skype for Business Server 2015 and traditional Private Branch Exchange (PBX). The company has three sites that are connected by a

Multiprotocol Label Switching (MPLS) topology. There are 1,250 users who use Skype for Business Server 2015, and 2,250 users who use the PBX environment. On average, the company has three percent of its users dialing in for conferences and six percent on a public switched telephone network (PSTN) call at any time.

The company plans to remove the PBXs and have all users use only Skype for Business Server 2015.

You need to generate a usage model based on the existing data usage and real-time communications through all of the PBXs.

Which two pieces of information should you collect when you perform usage modeling? Each correct answer presents part of the solution.
A . number of PSTN channels provisioned
B . number of calls that use
C . 722
D . number of intersite calls through PSTN
E . number of calls that use RTAudio Wideband
F . number of peer-to-peer (P2P) calls over the MPLS network

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Answer: BC