You have a Hub Transport server named Server1 that runs Exchange Server 2010. All
Exchange users use IMAP4 to retrieve e-mail. You need to ensure that all users can send email by using SMTP.
Your solution must not require any modifications to the default connectors.
What should you do?

A.
Configure IMAP4 clients to send e-mail by using TCP port 25.

B.
Configure IMAP4 clients to send e-mail by using TCP port 587.

C.
Create a new Send connector and configure the connector to use port 110.

D.
Create a new Send connector and configure the connector to use port 143.