What are the final values of $Q_1$ and $Q_0$ after 4 clock cycles, if initial values are 00 in the sequential circuit shown below?\n[Circuit: T flip-flop Q0 clocked by CLK, T input is 1. T flip-flop Q1 clocked by Q0 output? No, arrow from Q0 to Clock of Q1. T input of Q1 is 1.]
- A. 11
- B. 01
- C. 10
- D. 00
Answer: D. 00
Explanation: This is a 2-bit counter. $Q_0$ toggles every clock. $Q_1$ toggles when $Q_0$ provides a clock edge (assuming negative edge triggered if it's a ripple counter, or based on diagram arrows). \nSequence: 00 -> 01 -> 10 -> 11 -> 00. \nAfter 4 cycles, a 2-bit counter resets to 00.