3. (3 marks) A sequential circuit with two D flip-flops A and B, one input x, and one output z is specified by the following next-state and output equations: A(t 1) A' B B(t + 1)=B,x z=A+B' a) (1 mark) Draw the logic diagram of the circuit. b) (1 mark) Tabulate the state table for the circuit. c) (1 mark) Draw the corresponding state diagram