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2 points Q3/To Design 12-bit BCD adder must using * 3 (4-bit binary adder), 3F.A and 3 H.A 1 (8-bit binary adder), 1 (4-bit binary adder), 2 F.A and 4 H.A None of them 1 (8-bit binary adder), 1 (4-bit binary adder), 3 F.A and 6 H.A 2 (8-bit binary adder), 4 F.A and 2 H.A