The correct answer is: A. border-top-color
The border-top-color property sets the color of the top border of an element. It is a CSS property that is used to specify the color of the top border of an element. The value of this property is a color value, such as "red" or "blue".
The border-left-color, border-right-color, and border-bottom-color properties are used to specify the color of the left, right, and bottom borders of an element, respectively.
Here is an example of how to use the border-top-color property:
css
div {
border-top-color: red;
}
This code will set the color of the top border of all div elements to red.
