Which of the following is NOT a component of a CPU?

The answer indicates that PIR is not a component of a CPU. A CPU, or Central Processing Unit, is comprised of several critical components that work together to perform computations and process data. These components include:

• The Arithmetic Logic Unit (ALU), which is responsible for performing arithmetic and logical operations.
• The Control Unit, which directs the operation of the processor and coordinates how data moves around the CPU and between other parts of the computer system.
• Registers, which are small storage locations within the CPU used to hold temporary data and instructions during execution.

In contrast, a PIR, which typically refers to a Passive Infrared Sensor, is a device used in security applications to detect motion based on changes in infrared radiation rather than being a functional part of the CPU. Thus, identifying PIR as not being a CPU component is accurate given its relevance to peripheral security systems rather than the core functionalities of a CPU.