A Cisco Email Security Appliance uses which message filter to drop all executable attachments entering and leaving the Cisco Email Security Appliance?

A Cisco Email Security Appliance uses which message filter to drop all executable attachments entering and leaving the Cisco Email Security Appliance?
A . drop-ex
B . if (attachment-filename == "\.exe$") OR (attachment-filetype == "exe") { drop(); }
C . drop-ex
D . if (recv-listener == "InboundMail" ) AND ( (attachment-filename == "\.exe$") OR (attachment-filetype == "exe")) { drop(); }
E . drop-exe! if (attachment-filename == "\.exe$") OR (attachment-filetype == "exe") { drop(); }
F . drop-exe! if (recv-listener == "InboundMail" ) AND ( (attachment-filename == "\.exe$") OR (attachment-filetype == "exe")) { drop(); }

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Answer: A