Microprocessor
When referring to instruction words, a mnemonic is

 a short abbreviation for the operand address.
 a short abbreviation for the operation to be performed.
 shorthand for machine language.
 a short abbreviation for the data word stored at the operand address.

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Microprocessor
The stack pointer register in a microprocessor

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

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