Answer: Presentation tier.
Step-by-step 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.