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 e-mail 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.