You need to identify the latency of client connections to the Mailbox server

You have an Exchange Server 2010 organization that contains one Mailbox server. All users
connect to Exchange by using Microsoft Office Outlook 2010. You need to identify the
latency of client connections to the Mailbox server. What should you run?

A.
Exchange Best Practices Analyzer

B.
Message Tracking Performance tool

C.
Test-OutlookConnectivity cmdlet

D.
Test-OutlookWebServices cmdlet