Microprocessor
The data bus of any microprocessor is always

 Either unidirectional or bi-directional
 Unidirectional
 None
 Bi-directional

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Microprocessor
Program counter in a digital computer

 Counts the number of times a subroutine is called.
 Points the memory address of the next instruction to be fetched.
 Counts the numbers of programs run in the machine.
 Counts the number of times the loops are executed.

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