Answer :
One of the five types of classes that make up the sequence diagram lifelines is the boundary class A boundary class is a class that represents the boundary objects or systems.
This class serves as an interface between the users and the system. It depicts how the system interacts with its users or external entities that send and receive information. It represents the objects with which the user interacts to achieve an application goal.
Boundary classes are used to model the boundaries or interface of a system. They do not represent a real system component but a wrapper around it. This class serves as an interface between the users and the system.
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