To expand a 2-bit parallel adder to a 4-bit parallel adder, you must Select one: O a. use two 2-bit adders with no interconnections O b. use two 2-bit adders with the carry output of one connected to the carry input of the other c. use two 2-bit adders and connect the sum outputs of one to the bit inputs of the other d. use four 2-bit adders with no interconnections

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A:

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