You work as the enterprise exchange administrator at Xxx .Xxx is using Microsoft Exchange Server 2010 as their messaging solution.The Xxx network has two Mailbox servers named XXX-EX01 and XXX-EX02.During the course of the week you receive an instruction from the CIO to determine the amount of time it takes for the delivery of messages between XXX-EX01 and XXX-EX02.Which of the following commands can be used to achieve this goal？（）

• A、You must use the Test-ServiceHealth cmdlet.
• B、You must use the Test-Mailflow cmdlet.
• C、You must use the Get-MailboxStatistics.
• D、You must use the Get-MailboxDatabase.