Correct Option: D

A device driver is a computer program that enables the operating system to interact with a hardware device. It provides the operating system with information of how to control and communicate with a certain piece of hardware. The driver is an important and vital piece to a program application. Device driver is the program which co-ordinates with CPU to regulate the devices. Register, cache & main memory are directly connected to CPU.
So only Disk from given options require device drivers. Hence (d) is correct option.