Microprocessor
S0 and S1 pins are used for

 serial communication
 indicating the processor’s status
 acknowledging the interrupt
None of these

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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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