Which two statements are true when comparing ESMTP and SMTP? (Choose two.)

[answerhappygod]

Which two statements are true when comparing ESMTP and SMTP? (Choose two.)

A. Only SMTP inspection is provided on the Cisco ASA firewall.
B. A mail sender identifies itself as only able to support SMTP by issuing an EHLO command to the mail server.
C. ESMTP mail servers will respond to an EHLO with a list of the additional extensions they support.
D. SMTP commands must be in upper case, whereas ESMTP can be either lower or upper case.
E. ESMTP servers can identify the maximum email size they can receive by using the SIZE command.