Answer Posted / aditya sharma

Three tire architecture as Module View Controller.

Tier 1: the client contains the presentation logic,
including simple control and user input validation. This
application is also known as a thin client.
[Jsp]

Tier 2: the middle tier is also known as the application
server, which provides the business processes logic and the
data access.
[Servlets, Java, DAO]

Tier 3: the data server provides the business data.
[Database]

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