Which cmdlet should you run?

You have an Exchange Server 2010 SP1 organization. The organization contains five servers. The servers are configured as shown in the following table:

All users access their mailbox using Microsoft Outlook 2010. Users report that they cannot download their offline address book (OAB). You verify that the users can successfully connect to their mailbox.
You need to identify what is preventing users from downloading the OAB.
Which cmdlet should you run?
A. Test-MapiConnectivity.
B. Test-MailFlow.
C. Test-SmtpConnectivity.
D. Test-ServiceHealth.
E. Get-MailboxStatistics.
F. Test-OutlookWebServices.
G. Get-MailboxFolderStatistics.
H. Get-MailboxDatabase.
I. Test-MRSHealth.
J. Get-Transport.
K. Get-Message.