5. [20pts] The circuit in Figure 3 looks like a counter. The problems are: A: Please derive the characteristic table of T flip-flop which is used in this circuit. [5pts] B: Draw waveforms for the Qo, Q1, and Q2 signals (assuming reasonable delays) [5pts]. C: Write down the counting sequence of this circuit. [5pts] D: Please judge whether the circuit is synchronous logic or asynchronous logic? Why? [5pts] Q1 AL T T T Clock Q Q Figure 3 the circuit