Final answer:
CMOS stands for Complementary Metal-Oxide Semiconductor, a technology used for creating integrated circuits with low power consumption and in PCs, it refers to the memory that stores BIOS settings.
Step-by-step explanation:
The term CMOS stands for Complementary Metal-Oxide Semiconductor. It refers to a technology used to construct integrated circuits, including microprocessors, microcontrollers, static RAM, and other digital logic circuits. CMOS technology is known for its low power consumption and high noise immunity.
In the context of personal computers, CMOS also commonly refers to the small amount of memory on the motherboard that stores the BIOS settings. These settings, such as system time and hardware configurations, are preserved when the computer is turned off by a small CMOS battery. The correct answer from the provided options is therefore Option 3: Complementary Metal-Oxide Semiconductor.