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

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

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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
 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
 The data line can be multiplexed for both input and output

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