Which CSS property is used to set the background image of an element?background-imagebackgroundimage-urlbackground-url

The correct CSS property used to set the background image of an element is background-image.

Explanation

The background-image property in CSS is specifically designed to define an image as the background for an element. When you use this property, you provide the URL of the image that you want to display. This property is part of the Background and Border properties in CSS, and it allows a variety of images to be used as backgrounds, including gradients, solid colors, and patterns.

Here’s an example of how to use the background-image property in CSS:

.element {
    background-image: url('path/to/your/image.jpg');
}

In the example, the url() function is utilized to specify the path to the image file you want to serve as the background. It's important to note that while the properties backgroundimage-url and background-url might seem plausible, they are not valid CSS properties, which makes background-image the correct choice in this context.