Which two factors must be considered when message filter processing is configured? (Choose two.)

Message-filter order and MIME structure of the message are two factors that must be considered when message filter processing is configured on Cisco ESA. Message-filter order determines the sequence in which message filters are evaluated and applied to incoming messages, which can affect the final outcome of the filtering process. MIME structure of the message determines how message filters match against different parts of the message, such as headers, body, attachments, etc., which can affect the accuracy and performance of the filtering process.
Reference: User Guide for AsyncOS 15.0 for Cisco Secure Email Gateway, page 3-3 and page 3-5.
Reference: https://www.cisco.com/c/en/us/td/docs/security/esa/esa12-0/user_guide/ b_ESA_Admin_Guide_12_0/b_ESA_Admin_Guide_chapter_01000.html