Discussion
Tri state Buffers provide
(i) reduction of current consumption in the circuit.
(ii) isolation from input to output.
(iii) high impedance during OFF state.
(iv) low impedance during ON state.
Answer: D
The key accepts (i) and (iii), the fourth option. A tri-state buffer provides a high impedance state when it is off, which disconnects the output from the line so that many devices can share a bus, and the key also counts the reduction of current drawn from the shared line as a benefit.
The remaining options each carry one of (ii) or (iv), which the key does not accept, so they do not match the key's choice of the fourth option.
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