An organization plans to migrate to Office 365.

You need to estimate the post-migration network traffic.
Which tool should you use?

A.
Lync 2013 Bandwidth Calculator

B.
Process Monitor

C.
Microsoft Network Monitor

D.
Microsoft OnRamp Readiness tool

Explanation:
Office 365 includes Lync 2013.
With this latest version of the Microsoft Lync Server 2010 and 2013 Bandwidth Calculator, you can
enter information about your users and the Lync Server features that you want to deploy, and the
Bandwidth Calculator will determine bandwidth requirements for the WAN that connects sites in
your deployment. The accompanying Bandwidth Calculator User Guide describes the recommended
process for estimating your WAN bandwidth needs for Lync client real-time traffic.

Lync Server 2010 and 2013 Bandwidth Calculator Version 2.0
http://blogs.technet.com/b/nexthop/archive/2013/06/07/lync-server-2010-and-2013-bandwidthcalculator-version-2-0.aspx