Microprocessor
When referring to instruction words, a mnemonic is

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

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Microprocessor
A microprocessor is ALU

 register unit and control unit on a single chip.
 and control unit on a single chip.
 register unit and I/O device on a single chip.
 and memory on a single chip.

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