The control logic for a binary multiplier is specified by a states diagram. The state diagram has four states and two inputs. To implement it by the sequence register and decoder method.

• A. two flip-flop & 2 x 4 decoder are needed
• B. four flip-flop & 2 x 4 decoder are needed
• C. two flip-flop & 3 x 9 decoder are needed
• D. four flip-flop & 3 x 9 decoder are needed