What is the correct sequence of sequential logic circuit analysis（______）？ 下面关于时序逻

辑电路分析步骤的正确顺序是（______）？ 1. Check whether the circuit can self-start 检验电路是否可以自启动 2. Write down the Excitation Equation for each flip-flop 写出每个触发器的驱动方程 3. Starting from a predefined initial state, derive the next state one after another, until the next states have been analyzed before. 从给定的初试状态开始，依次分析电路的下一状态，直到下一状态已经分析过为止。

A、123

B、231

C、321

D、312