You are developing an ASP.NET MVC web application for viewing a photo album. The application is
designed for devices that support changes in orientation, such as tablets and smartphones. The
application displays a grid of photos in portrait mode.
When the orientation changes to landscape, each tile in the grid expands to include a description. The
HTML that creates the gallery interface resembles the following markup.

If this CSS is omitted, the existing CSS displays the tiles in landscape mode.
You need to update the portrait mode CSS to apply only to screens with a width less than 500 pixels.
Which code segment should you use?
Correct Answer: D
Explanation/Reference:
Explanation:
Screen is used for computer screens, tablets, smart-phones etc.
max-width is the maximum width of the display area, suchas a browser window.
References: http://www.w3schools.com/cssref/css3_pr_mediaquery.asp