CMOS (Complementary Metal-Oxide-Semiconductor) technology is the backbone of modern digital electronics. It is most commonly used in the fabrication of integrated circuits (ICs), including:
Microprocessors,
Memory chips (e.g., RAM),
Digital logic circuits.
CMOS offers advantages like:
Low static power consumption,
High noise immunity,
High density of logic functions.
Why the other options are incorrect:
(A) Magnetic storage uses ferromagnetic materials, not CMOS.
(B) Optical fibers involve glass or polymer materials for light transmission, unrelated to CMOS.
(D) Electromechanical systems (e.g., motors, actuators) use mechanical and electrical components, not CMOS.
Thus, CMOS is specifically used in building digital integrated circuits.