Which component is crucial for enabling communication between different devices in a computer system?

The choice of interface boards as the crucial component for enabling communication between different devices in a computer system is appropriate because interface boards serve as the intermediary that connects various hardware components. They facilitate the transfer of data between devices such as hard drives, graphics cards, and network interfaces, ensuring that they can communicate effectively with each other and with the central processing unit (CPU).

Interface boards often include various ports and connectors that standardize communication protocols, allowing devices with different functions and designs to work together within the computer system. This function is essential, as it enables the seamless integration of devices, ultimately contributing to the overall performance and functionality of the system.

In contrast, the other components mentioned play different roles: the ALU performs calculations and logical operations, the control unit directs the operation of the processor and coordinates tasks, while expansion boards augment the capabilities of a system but do not inherently facilitate communication between devices in the same way that interface boards do. Thus, interface boards are fundamentally key for enabling inter-device communication.