How can you specify multiple background images in CSS?

Specifying multiple background images in CSS is effectively achieved by utilizing the background-image property along with a comma-separated list of image URLs. This allows you to layer multiple images on top of one another, with the first image appearing at the top and subsequent images layered beneath it. Each image can be positioned and sized individually by using additional CSS properties like background-position, background-size, and background-repeat.

This method enables greater design flexibility, allowing developers to create visually rich interfaces easily without the need for multiple <div> elements or complex structures. By handling multiple images within a single property, the CSS remains concise and manageable, promoting a clean codebase.

The other choices suggest alternative methods that do not utilize CSS's built-in capability for handling multiple backgrounds directly through the background-image property. Using the background property only once does not accommodate multiple images, and specifying each image in separate divs complicates the layout unnecessarily. Meanwhile, a transparent overlay isn't a method for specifying multiple backgrounds but rather a technique that may enhance the visual appearance of a single background image.