= (a, b, c, d), L= { apb'c'd I p, q, r, 5 > O AND p=q and r=s) In the PDA skeleton, q0 is the start state, q4 is the final state and (20) is the stack symbol. Complete the PDA by adding necessary transitions and answer the following questions. 90 91 92 q3 94 1. What should be the result of the transition function 8 (90, a, a)? 2. What should be the result of the transition function 8 (90, b, ZO)? 3. What should be the result of the transition function 8 (91, b, a)? 4. What should be the result of the transition function 8 (q1, b, b)? 5. What should be the result of the transition function 8 (91, c, b)? 6. What should be the result of the transition function 8 (91, c, ZO)? 7. What should be the result of the transition function 8 (93, d, c)? 8. What should be the result of the transition function 8 (q3, d, d)