Multiple choice A half adder is an arithmetic circuit that generates the sum of ______. 3 binary digits 2 binary digits 4 binary digits none of these Reveal answer Fill a bubble to check yourself B Correct answer Explanation A half adder is a digital circuit that adds two binary digits (bits) and produces a sum and carry output. It operates on only 2 bits at a time, unlike a full adder which handles three inputs including carry-in.