Which of the following components is considered an elementary building block of a digital circuit?

The component considered an elementary building block of a digital circuit is the logic gate. Logic gates are fundamental components in digital electronics that perform basic logical functions on one or more binary inputs to produce a single binary output. They are the foundation for the construction of more complex digital circuits, such as adders, multiplexers, and other fundamental components of computing systems.

Logic gates implement operations such as AND, OR, NOT, NAND, NOR, XOR, and XNOR, which are essential for processing binary information. By combining multiple logic gates, more complex operations and decision-making processes can be created, enabling sophisticated computing tasks.

While transistors, capacitors, and resistors are essential components used within digital circuits, they do not directly perform logical operations as logic gates do. Transistors are widely used as switches or amplifiers within these gates, but they are not standalone components for logical processing. Therefore, the correct focus on logic gates aligns perfectly with their role as the basic building blocks in a digital circuit.