You have an Exchange organization. All servers in the organization have Exchange Server
2010 Service Pack 1 (SP1) installed. All servers run Windows Server 2008 R2.
The organization contains Mailbox servers, Client Access servers, and Hub Transport
servers only.
You need to identify why a server on the Internet rejects email messages sent from users in
the organization.
What should you do?

A.
Review the connectivity logs

B.
Run the Exchange Server User Monitor (ExMon)

C.
Run the Get-MailboxFolderStatistics cmdlet

D.
Modify the Log Settings from the properties of the Hub Transport server

E.
Review the Application event log

F.
Run the Set-AdminAuditLogConfig cmdlet

G.
Run the Set-EventLogLevel cmdlet

H.
Run the Get-User cmdlet

I.
Modify the Server Diagnostic Logging Properties

J.
Run the Exchange Best Practices Analyzer
K.
Enable SMTP protocol logging
L.
Run the Get-MailboxStatistics cmdlet

Explanation:
http://technet.microsoft.com/en-us/library/bb124531.aspx