Which of the following input devices uses switch contacts placed under a plastic pad, which may be inscribed with symbols?

A touch pad (touchscreen) uses switch contacts placed under a plastic pad that can be inscribed with symbols. When pressure is applied to specific areas, the underlying contacts make connection, registering input. This is characteristic of resistive touch technology where two conductive layers with contacts are separated by a spacer. Punched cards use holes, soft keyboards are virtual interfaces, and mice use optical/trackball sensors.