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 over the data bus at the same time
 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

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Microprocessor
DS directive in 8085

None of these
Forces the assembler to reserve one byte of memory
Forces the assembler to reserve a specified number of bytes in the memory
Forces the assembler to reserve a specified number of consecutive bytes in the memory

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