In a three-tier architecture, operations relating to user interaction with the application are placed in the tier.
presentation
business rules
data
it depends on the application

Presentation tier.

Explanation:

 Three-tier architecture are basic model of software development. This architecture model are beneficial for using in projects like web integration. Each layer in this architecture are responsible for maintaining and develped their particular tasks.

In the three tier architecture, the presentation tier are also known as user interface tier or layer. Basically, it is responsible for operational interaction and it is used to display the information or data in user friendly format.

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