4. The following circuit with input X and output Y uses one RS flip-flop and a T flip-flop. Clk RA A SA 0 TB B (a) Write the logic expressions for RA, SA, TB and Y. (b) Obtain the state transition table for the circuit. Include A, B, X, RA, SA, TB, A, B, Y in this order. (c) Sketch the state transition diagram for the circuit. (d) Is this a Moore or a Mealy machine? Explain. [3 pts] [4 pts] [3 pts] [2 pts] Note: Consult flip-flop excitation table attached at the end as needed.