4. For the pushdown automata shown in Fig. 1 and Fig. 2, which one would accept the language L defined in Question #3 by empty stack? Use the execution of the string bbabaa to justify your answer. (10 points) a, a puska) push(a), a,b pop pop pop 0 b, X puskb) Start pop b, b push(b) push(a) pusfb) or_ nop pop -or- nop pop ,a,a a b push a push(a) pop Start or nop pop b, X b,b b,a push(b) push(b) pop Fig. 2