Which component is NOT one of the five parts of a computer?

The reasoning behind identifying this component as not belonging to the five parts of a computer is rooted in the foundational architecture of computer systems. The traditional five parts of a computer system include the input unit, output unit, memory (or storage), arithmetic logic unit (ALU), and the control unit.

The output unit is responsible for presenting data to the user, such as through a monitor or printer. The memory component stores data and instructions needed for processing. The control unit orchestrates how the operations of the computer's components are carried out and manages the flow of data within the system.

A modem, while important for communication and networking, is not a core component of the computer's fundamental architecture. It serves as a bridge for data transmission over phone lines or other communication media but does not fit within the main structural framework of a computer's basic functional parts. This distinction makes it clear why the modem is viewed as external to the core five parts.