Which message size limit in KB will the FortiMail apply to outbound email?

Refer to the exhibits showing SMTP limits (Session Profile ― SMTP Limits), and domain settings (Domain Settings, and Domain Settings ― Other) of a FortiMail device.

Which message size limit in KB will the FortiMail apply to outbound email?
A . 204300
B. There is no message size limit for outbound email from a protected domain.
C. 10240
D. 51200

Answer: D