The first three questions refer to the following parse tree. S B a S 00 a b ON Question 1: The parse tree above represents a nightmost derivation according to the grammar s = AB, A = a5|a, B b, find that rightmost derivation. Which of the following is a right-sentential form in this derivation? aSB aABDA aaBba aSba Question 2: Now, assume the parse tree above represents a leftmost derivation according to the grammars AB, A asa, B ba, and find that leftmost derivation. Which of the following is a left-sentential form in this derivation? aabab OaSbA asba aABbA Question 3: Now, suppose the parse tree above is a parse tree for some unknown grammar G. Which of the following productions is definitely not a production of G? None of the other choices. Ab OA -as S aC