Answer :
The five types of classes that make up the Sequence Diagram lifelines are:Boundary ClassesControl ClassesEntity ClassesBoundary ClassesBoundary Classes are utilized to support user interaction.
When a user communicates with a computer system, they typically use screens or devices to enter or retrieve data. Boundary classes communicate with the control classes in the context of a use case.Control ClassesControl classes are concerned with the execution of the use case, the coordination of collaborating classes, and the delegation of work to entity classes.
Entity classes store information about objects that must be maintained in the computer system. An entity class is any class that can be persisted, which means that it has a specific lifespan and can be retrieved from or saved to a permanent data store.
Helper ClassesHelper classes are used to support other classes in carrying out their responsibilities. They do not represent system elements that require persistence or support direct user interaction. Helper classes have methods that are used to perform routine functions that are useful to other classes, such as formatting data for display.
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