please show work

1. Use the following attribute grammar to answer the questions below 1. Syntax rule: assign> - Semantic rule: Syntax rule: Semantic rule: Predicate: .actual-type-expr>, expected-type Syntax rule: Semantic rule. .actual-type .actual Predicate: .actual-type-expr>, expected-type Syntax rule: semantic rule: actual type actual-type Syntax rule: Semantic rule: .actual-type [2].actual-type Predicate: [2].actual_ type [3]actual type expected-type .actual type 2. actual-type actual-type 3. + type 4. 5. [2] + [3] 6. Syntax rule: A | B | C Semantic rule: .actual type look-up(war>.string) a) Drawa fully attributed parse tree for the sentenceC BCA, assuming that A has type real, B has type int and c has type real. See Figure 3.8 in Sebesta for an example of such a tree b) According to the attribute grammar, is this sentence valid