$1.[5$ marks$]$ Abstract syntax trees are used to hold $...........$

a$.$ Key tokens

b$.$ All tokens

c$.$ Root token only

d$.$ Child tokens only

e$.$ None of the above

$2.[5$ marks$]$ Which of the following is not a design goals for an intermediate representation?

a$.$ dense

b$.$ convenient

c$.$ meaningful

d$.$ comprehensive

e$.$ none of the above

$3.[5$ marks$]$ Parsers generated by ANTLR start parsing the input starting at $........$

a$.$ First rule of the grammar

b$.$ Name of the grammar

c$.$ Second rule of the grammar

d$.$ Last rule of grammar

e$.$ none of the above

$4.[5$ marks$]$ Grammar rules can be augmented to $........$

a$.$ Declare variables to be used in actions

b$.$ Specify a return value for a rule

c$.$ Perform calculations$/$computations

d$.$ None of the above

e$.$ All of the above are true

$5.[5$ marks$]$ Implementation of visitors doesn$$t require grammar augmentation at all.

a$.$ True

b$.$ False

$6.[5$ marks$]$ Which of the following allows us to decouple grammars from application$-$specific code?

a$.$ Lexer

b$.$ Parser

c$.$ Visitor

d$.$ None of the above