Since Maria wants to encapsulate the main idea of the email, she should put this information in the subject line.
What is an ESP protocol?
An ESP is an acronym for encapsulating security payload (ESP) protocol and it can be defined as a standard protocol that provides secrecy for the contents (data) transmitted via network communications, system-to-system authentication and data integrity verification, so as to prevent unauthorized access.
Basically, the encapsulating security payload (ESP) protocol is a transport layer protocol that provides data confidentiality, integrity and authentication in IPv6 and IPv4 protocols.
In this scenario, Maria should put this information in the subject line.
Read more on encapsulating security payload here: https://brainly.com/question/14710912
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