Concept:The part labelled Q in the diagram identifies a main functional unit of the central processing unit (CPU) that is responsible for storing data and instructions.
Explanation:In the given computer system diagram, the labelled parts are used to test knowledge of the internal components of a computer.
The CPU is made up of the control unit, arithmetic and logic unit (ALU), and registers.
However, the part shown as Q represents a storage section that holds data and instructions before and during processing.
This function is performed by the memory unit, not by the control unit, data bus, or register.
Memory unit is the correct identification because it is the component that stores information for the CPU to access.
Answer:C. memory unit.
