This computer science problem involves algorithmic thinking and programming concepts. The solution below explains the approach, logic, and implementation step by step.

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Define the app layout and design
The correct option is Define the app layout and design.
In Android app development, XML (eXtensible Markup Language) is primarily used to define the user interface (UI) layouts, specifying the arrangement and properties of elements like buttons, text views, and images.
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The correct option is Define the app layout and design.
This computer science problem involves algorithmic thinking and programming concepts. The solution below explains the approach, logic, and implementation step by step.