Correct Answer: (b) Arithmetic and Logical Unit, Register and Control Unit
Note: Central processing unit consists of an Arithmetic and logic unit, Register and Control unit.
Control Unit this part controls the input and output devices
Arithmetic Logic Unit this is the part that does all the working out it does all the maths and makes the decisions.
Registers related to fetching information from RAM, a collection of storage registers located on separate chips from the CPL) Memory buffer register (MBR), Memory data register (MDR), Memory address register (MAR).