When a client connects to an application or system, the initial step is identification. Option D is correct.
What is the identification?
The ability to uniquely identify a user of a system or an application running in the system is referred to as identification. Authentication is the ability to demonstrate that a user or application is truly who or what it claims to be.
Identification is also called as the first step in connecting a client connects to an application or system.
Therefore, option D is correct.
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