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Firmware is a specific type of software that provides low-level control for a device's specific hardware. It is typically embedded into the hardware itself and is essential for the device to operate correctly. The BIOS, or Basic Input/Output System, is a prime example of firmware. It initializes hardware during the startup process and provides runtime services for operating systems and programs.

In contrast, other components listed, such as RAM, hard drives, and CPUs, do not fall under the firmware category. RAM (Random Access Memory) is volatile memory used to temporarily store data and is not programmed like firmware. Hard drives are storage devices that hold data and applications but do not contain the low-level control code associated with firmware. The CPU (Central Processing Unit) is the hardware that executes instructions and processes data but does not represent firmware either.

Therefore, BIOS is the correct selection as it illustrates the function and characteristics of firmware.