Discussion
A full adder has
Answer: C
A full adder has 3 inputs and 2 outputs.
A full adder adds two bits A and B together with a carry-in from the previous stage, and produces a Sum bit and a carry-out:
\[ \begin{aligned} S &= A \oplus B \oplus C_{in} \\ C_{out} &= AB + C_{in}(A \oplus B) \end{aligned} \]
Chaining full adders through their carries gives a multi-bit ripple-carry adder. A half adder has 2 inputs and 2 outputs, since it has no carry-in; '2 inputs and 1 output' describes a simple gate, and the other options match no adder.
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