You have an Exchange Server 2010 server that has IMAP4 enabled.All users connect to the Exchange server by using an IMAP4 client.You need to verify whether users can send e-mail to the Internet by using the Exchange server. What should you do？（）

• A、From the server， run the Test-ImapConnectivity cmdlet.
• B、From the server， run the Test-OutlookConnectivity cmdlet.
• C、From a client， attempt a connection to TCP port 143 by using Telnet.
• D、From a client， attempt a connection to TCP port 587 by using Telnet.