Question $3(1$ point$)$

Which of the following is NOT true about abstractions$?$

Abstractions are also called nonterminal symbols.

Abstractions are used to represent syntactic structures.

An abstraction cannot have two or more distinct definitions.

None of the above.

Question $4(1$ point$)$

In Scheme, which function is used to avoid parameter evaluation when it is not appropriate?

CDR

CAR

CONS

QUOTE