The correct answer is: D. scrollbar-face-color
The scrollbar-face-color property defines a color for the face of a scroll bar, including arrow regions and the scroll box.
The scrollbar-base-color property defines a color for the base of a scroll bar.
The scrollbar-arrow-color property defines a color for the arrow regions of a scroll bar.
The scrollbar-darkshadow-color property defines a color for the dark shadow region of a scroll bar.