Question#2:           (15)
With respect to petri-nets which of transitions are enabled for firing?
For enabled transitions,Show results of firing?

(a) 2 1 0 0

->  0 0 1 1

(b) 3 1 0 0

->  1 0 1 1

(c) 1 1 0 

->  1 1 0






A & B are enabled for firing