What are the functions of the CPU registers in a computer system? a) The MAR register specifies the memory address for the next read or write ope...

The answer is d) The CPU registers provide a level of memory that is faster and smaller than the main memory, and serve as visible registers for user programs to minimize references to the main memory.

The CPU registers are a small number of high-speed registers that are used by the processor to store data and instructions. They are much faster than the main memory, so they are used to store data that is frequently accessed by the processor. This helps to improve the performance of the processor.

The CPU registers are also used to store the current state of the processor. This includes the program counter, which stores the address of the next instruction to be executed, and the status register, which stores information about the processor's condition.

The CPU registers are visible to user programs, which means that they can be accessed by programs. This allows programs to minimize references to the main memory, which can improve the performance of the program.

The other options are not correct. MAR and MBR are registers that are used to access memory. IOAR and IOBR are registers that are used to access input/output devices. The memory module is the part of the computer system that stores data and instructions. The control and status registers are used by the processor to control instructions or by privileged routines of the operating system to control program execution.