Which component carries data between memory or peripherals and the processing unit?

Which component carries data between memory or peripherals and the processing unit?

• A. Program Counter
• B. Data bus
• C. Memory Address Register
• D. Accumulator

Answer: (B)

Data moves between memory, peripherals, and the processing unit along buses, with the data bus carrying the actual payload. During a read or write, the CPU exchanges data with memory or I/O devices over this path, while the address bus handles where that data is stored or fetched from, and the control signals coordinate the operation. The program counter, memory address register, and accumulator have other roles: the program counter tracks the next instruction to fetch, the memory address register holds the address being accessed, and the accumulator stores intermediate results during calculations. So, the data bus is the route that transports the data itself between memory or peripherals and the processing unit.

Data moves between memory, peripherals, and the processing unit along buses, with the data bus carrying the actual payload. During a read or write, the CPU exchanges data with memory or I/O devices over this path, while the address bus handles where that data is stored or fetched from, and the control signals coordinate the operation. The program counter, memory address register, and accumulator have other roles: the program counter tracks the next instruction to fetch, the memory address register holds the address being accessed, and the accumulator stores intermediate results during calculations. So, the data bus is the route that transports the data itself between memory or peripherals and the processing unit.