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Following is an implementation of 4-bit adder. B: A: Bi Ai Bo Ao Carry Carry Carry FullC Adder- Full Full Adder Adder Carry S3 S2 Si So Let A 01012 and B-01102 A. What is the output value of S in binary format? B. What is the value of carry bit C4? C. If A and B are unsigned 4-bit integers, is there an overflow? Why? D. If A and B are signed 4-bit integers in 2's complement representation, is there an overflow? Why