Which of the following is an appropriate explanation of some functional units that
constitute a computer system?
a) The arithmetic and logical unit performs calculation processing at the direction of
the control unit.
b) The arithmetic and logical unit exchanges data with the control unit, the input unit,
and the output unit.
c) The memory unit requests the arithmetic and logical unit to perform calculation
processing and stores the results.
d) The memory unit requests the output unit to read out data from the memory unit.