Discussion
In the following circuit, the transistor functions as :
Answer: A
The circuit works as an OR gate.
Both transistors are emitter followers sharing one emitter resistor R, with the output Y taken from the common emitters. If either input A or input B is high, that transistor conducts and pulls Y up to about one base-emitter drop below the input, so Y is high. Only when both inputs are low are both transistors off, and R pulls Y down to ground.
Y is high when A or B (or both) is high, which is the OR function. An AND gate would need the transistors in series. NOR and NAND need an inverting stage, with the output taken from a collector resistor, which this circuit does not have.
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