Option (A) is the correct answer of this question.
Explanation:
TLS(Transport Layer Security) is the organization's best protocol for creating a secure connection between one of the mail servers and the mail server of the business partner.The relation is private (or secure) because the transmitted data is encrypted using symmetric cryptography.
The primary objective of the TLS protocol is to provide privacy and data integrity between two or more computer applications which communicate.
(TCP / IP Model) TLS functions between the Transport layer and the (kind of) Application layer.
It literally wraps the Application Layer traffic during transport in encryption.
In between layers, the TLS Key Exchange happens.
Other options are incorrect because they are not the best protocol for planning to establish a secure link .
When an individual user works in stand-alone mode, the workstation performs all the functions of a server by storing, accessing, and processing data as well as providing a user interface.
