Control Unit
- The control unit is a crucial part of the CPU that manages and coordinates all the operations within the computer.
- It directs the flow of data and instructions between the CPU, memory, and other input/output devices.
- The control unit decodes the instructions fetched from memory and executes them accordingly.

Memory Unit
- The memory unit stores data, instructions, and intermediate results during processing.
- It consists of RAM (Random Access Memory) and ROM (Read-Only Memory) which are essential for the functioning of the computer.
- RAM is volatile memory used for temporary storage, while ROM is non-volatile memory that stores essential system instructions.

ALU (Arithmetic Logic Unit)
- The ALU is responsible for performing arithmetic and logical operations within the CPU.
- It carries out tasks such as addition, subtraction, multiplication, division, and comparison operations.
- The ALU is a critical component for processing data and executing instructions.

All of the Above
- The CPU consists of the control unit, memory unit, and ALU, which work together to process data and execute instructions.
- Each component plays a vital role in the functioning of the CPU and overall computer system.
- Together, these parts form the core processing unit that drives the operations of the computer.