Microprocessor
The output data lines of microprocessor and memories are usually tristated because

 More than one device can transmit information over the data bus by enabling only one device at a time
 It increases the speed of data transfer over the data bus
 More than one device can transmit over the data bus at the same time
 The data line can be multiplexed for both input and output

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Microprocessor
When referring to instruction words, a mnemonic is

 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.
 shorthand for machine language.

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