You work as the enterprise exchange administrator at Xxx .The Xxx network is running in a Microsoft Exchange Server 2010 environment.You are responsible for managing a Mailbox server named XXX-EX02.The employees at Xxx use Microsoft Office Outlook 2010 to access to the Exchange environment.What actions must you take to determine the amount of lag for connections to XXX- EX02？（）

• A、You must use the Test-Mailflow cmdlet.
• B、You must use the MSExchangeTransport diagnostic logging.
• C、You must use the Test-ServiceHealth cmdlet.
• D、You must use the Test-OutlookConnectivity cmdlet.