Sure, here is an SEO-friendly HTML answer for the interview question:

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Optimizing a Mobile Application for Various Screen Sizes and Resolutions

When optimizing a mobile application for various screen sizes and resolutions, it is important to follow these steps:

1. Use Responsive Design: Utilize CSS media queries to adjust the layout and design of the app based on the screen size and resolution.
2. Adapt UI Elements: Ensure that all UI elements, such as buttons, text, and images, are scalable and readable on different screens.
3. Test on Multiple Devices: Check the app on various devices with different screen sizes to identify any display issues and make necessary adjustments.
4. Optimize Images: Compress images and use different image sizes for different screen resolutions to improve loading times and visual quality.
5. Utilize Viewport Meta Tag: Include the viewport meta tag in the HTML to ensure the app renders correctly on mobile devices.

By following these steps and consistently testing and optimizing the app, you can provide a seamless user experience across different devices and screen sizes.

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Focus Keyword: Optimizing a Mobile Application for Various Screen Sizes and Resolutions

This HTML answer is structured to provide a comprehensive overview of the optimization process for mobile applications while incorporating the focus keyword for SEO purposes.