Consider the following grammar and its attribute:

A1 A2 + T A1 A2 A T T1 T2 + N T1 T2 / N T + N N1 (+,-) N2 (A) N number A1.str = concat (A2.str, T.str, "+") A1.str = concat (A2.str, T.str, "-") A. str = T. str T1.str = concat(T2.str, N.str, " +") T1.str = concat (T2.str, N.str, T.str = N. str N1.str= concat (N2.str, "+/-") imeans + or - N.str = A. str N.str = number.val a. What does the above attribute grammar do? Explain. b. Which attributes are synthesized, and which are inherited? c. Fully decorate the parse tree: 32/(12 - 4) * 2. Show all attribute variables and how they are passed in the tree. A1 A2 + T A1 A2 A T T1 T2 + N T1 T2 / N T + N N1 (+,-) N2 (A) N number A1.str = concat (A2.str, T.str, "+") A1.str = concat (A2.str, T.str, "-") A. str = T. str T1.str = concat(T2.str, N.str, " +") T1.str = concat (T2.str, N.str, T.str = N. str N1.str= concat (N2.str, "+/-") imeans + or - N.str = A. str N.str = number.val a. What does the above attribute grammar do? Explain. b. Which attributes are synthesized, and which are inherited? c. Fully decorate the parse tree: 32/(12 - 4) * 2. Show all attribute variables and how they are passed in the tree