(i) Illustrate why Petri-Net models are useful in embedded system design. (ii) For the following Petri-Net model, the initial scenario with given number of tokens at place/nodes are as follows: X0={2,0,0,1} for respective nodes at P1, P2, P3 and P4. Find out the final scenario after firing of each transition t1,t2 and t3. Figure 1: Initial Firing at each node..