The control unit is a part of the processor. A processor is an integrated electronic circuit that performs the calculations that run a computer. An address bus is a computer bus that is used to address the main system memory. The address bus is used by a processor to indicate the memory location that it is about to read data from or write data to. Some processors may also use it to indicate an input/output port that is about to be read or written. Additional InformationNameExplanationData busA data bus is a system within a computer or device, consisting of a connector or set of wires, that provides transportation for data. A data bus can operate as a parallel or serial bus depending on how the information is carried. A parallel bus is employed in more complex connections that must carry more than one bit at a time. Cache memoryCache memory is a high-speed memory, which is small in size but quicker than most memory (RAM). The central processing unit will access it additional quickly than the primary memory. So, it is used to synchronize with a high-speed central processing unit and to enhance its performance. Control unitA control unit (CU) handles all processor control signals. It directs all input and output flow, fetches code for instructions from microprograms, and directs different units and models by providing control and timing signals. Hence, the correct answer is the Control unit.