A 4 bit parallel binary adder is to be constructed using a combination of Full Adders and Half adders to perform the addition of two 4 -bit binary numbers A and B, where A= A3 A2 A1 AO and B= B3 B2 B1 B0. Then for which of the following bits would you use a half adder? а. AO and BO b. A1 and B1 С. A3 and B3 d. A2 and B2

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