You have an Exchange Server 2010 organization.You need to determine why a remote SMTP server rejects e-mail sent from your organization.What should you do？（）

A. Review the application event logs.
B. Review the message tracking logs.
C. Set the Protocol logging level to Verbose on the Receive connectors and then review the protocol log files.
D. Set the Protocol logging level to Verbose on the Send connectors and then review the protocol log files.