Multi-choice problem: Choose from the options at the end, and answer how do you do this: How can I keep my rugs from sliding around on my ceramic or smooth floors?

Available options: a). Tape down one side of velcro on the top of the rug and the other side on the top of the floor, then stick them together to stay put. b). Tape down one side of velcro on the bottom of the rug and the other side on the top of the floor, then stick them together to stay put.
b).