Microprocessor
The multiplexing of address bus and data buses is used in

 never multiplexed.
 depends on the internal architecture.
 all the microprocessors.
 none of these.

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Microprocessor
The stack pointer register in a microprocessor

 counts the number of programs being executing on the microprocessor
 keeps the address of the next instruction to be fetched
 holds the address of the top of the stack
 counts the number of instructions being executing on the microprocessor

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