Explanation: The basic building blocks of a digital circuit are Logic Gates.

Logic Gates are electronic circuits that perform Boolean algebra operations (AND, OR, NOT, etc.).

They process binary inputs (0s and 1s) to produce a specific output.

Used in microprocessors, memory devices, and digital electronics.

Types of Logic Gates:

Basic Gates: AND, OR, NOT

Universal Gates: NAND, NOR

Special Gates: XOR, XNOR



Other Options:

CMOS (A) – A semiconductor technology used in digital circuits but not the fundamental building block.

BIOS (C) – Basic Input/Output System, used for system booting, not a digital circuit component.

DMOS (D) – A type of transistor technology, not the basic building block of digital circuits.