Concept:The CPU is built around two core units that work together to process instructions.Explanation:The central processing unit (CPU) mainly consists of the control unit and the arithmetic logic unit (ALU).The control unit manages and coordinates all operations of the computer.The ALU performs all arithmetic calculations and logical comparisons.Registers, memory, and buses are important supporting parts, but they are not the two main components of the CPU.Answer:C. control unit and ALU