Discussion
A 2-input gate that can be used to pass a digital waveform unchanged at certain times and inverted at other times is a(n) ________.
Answer: D
Correct answer: XOR gate
Holding one XOR input at 0 passes the other input unchanged, since \( 0\oplus X = X \); holding it at 1 inverts it, since \( 1\oplus X = X' \). That makes the XOR a controlled inverter, which no other two-input gate provides.
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