Q2 Petri Net Figure 4 below shows two Petri nets A and B which are quite similar. The transitions are labeled a, b & oc. Figure 4: Q2 Petri Nets I. What are the possible sequences of transition executions that could be performed by Petri net A? 2. Write a regular expression of the sequence in 1 3. What are the possible sequences of transition executions that could be performed by Petri net B? 4. Write a regular expression of the sequence in 3