Microprocessor
A microprocessor is ALU

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

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

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

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