You need to verify whether users can send email to the Internet by using the Exchange server

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 email 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.