1. This question is about lexing, parsing, and CFGS (= context free grammars). (a) For each of the following statements about ASTs (= abstract syntax trees), state whether they are true or false. Correct answers are awarded 2 marks; wrong answers are penalised by 1 mark (to a minimum of O marks for this question). Omitted answers do not contribute positively or negatively to your grade. [14 marks] v. The purpose of constructing an AST is to represent the structure of the computer program, to simplify code generation. vi. The purpose of constructing an AST is to allow the compiler to generate faster executable machine code. vii. Dynamically typed languages like Python and Javascript don't need to do lexing and parsing